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[MSM] How to access event-attributes through a "kleene"-event?
by Deniz Bahadir 24 Feb '13

24 Feb '13

Hello everyone, I am trying to use Boost.MSM with the eUML front-end and I must say: That is a pretty cool thing! :-) However, I stumbled across some points that raised several questions, which I hoped someone of you could answer. One of these points is the usage of the "kleene" event (with eUML). The questions that came to mind are the following: 1. Is there a way to access an attribute of an (original) event if the transition-table uses the "kleene" event? 2. If there is a way, can I access it directly from the guard or actions-list in the transition-table? 3. If there is not a way, is it planned to be implemented (if possible) and when? For better understanding I insert here a simple example which explains what I am trying to do: In my special case, all my events have an attribute "EventNo" which is a unique number for each event(-type). Now, I need a transition for the events with "EventNo" greater than a special number (e.g. 7). So I thought, I could do something like this: // The attribute: BOOST_MSM_EUML_DECLARE_ATTRIBUTE(int, EventNo) BOOST_MSM_EUML_ATTRIBUTES((attributes_ << EventNo), EventNoAttr) // All events that contain this attribute: BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES(event1, EventNoAttr) BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES(event2, EventNoAttr) /* ... */ BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES(eventN, EventNoAttr) // Entry-action of FSM which initializes these event-numbers: BOOST_MSM_EUML_ACTION(init_all_events) { template <class Evt, class Fsm, class State> void operator()(Evt const&, Fsm&, State&) { event1.get_attribute(EventNo) = 1; event2.get_attribute(EventNo) = 2; /* ... */ eventN.get_attribute(EventNo) = N; }; } // Some states: BOOST_MSM_EUML_STATE((), State1) BOOST_MSM_EUML_STATE((), State2) // The transition table which contains all the logic: BOOST_MSM_EUML_TRANSITION_TABLE(( State1 + kleene [event_(EventNo) > Int_<7>()] // <-- Not working! == State2, State1 + event1 == State3 /* event2 to event7 are ignored! */ ), stt) // The FSM front-end and back-end: BOOST_MSM_EUML_DECLARE_STATE_MACHINE(( stt, init_ << init_all_events ), FsmFrontend; typedef msm::back::state_machine<FsmFrontend> Fsm; However, the expression "event_(EventNo)" in the transition-guard fails to compile with the following error: error: no match for call to ‘(boost::msm::front::euml::GetEvent_<EventNo_>) (const boost::msm::front::euml::kleene_&, boost::msm::back::state_machine< boost::msm::front::euml::func_state_machine<FsmFrontendtag, ...’ I read in the documentation of the Functor front-end that I should use boost::any::type() to access the original event in transition actions, but I do not really know how to go on with it. I am also not sure if this applies to the eUML front-end at all (especially in the transition-guard). I hope someone can help me and answer these questions!? Thanks in advance, Deniz Bahadir

2 6

[asio] Adding methods directly to the IO_Service for it to call.
by Ryan 24 Feb '13

24 Feb '13

Boost Community, I've created a basic class that wrapped the boost asio framework receive/send functionality. My wrapper class gave the packet buffer to whatever processing function that it was created with and when the function was done sent any buffers it was given. This let me create classes that processed data without any knowledge of the transport layer. This concept has worked well since the asio sockets have an async_receive and async_send. I was able to setup all of my classes and then call io_service.run() to get everything going. I now have to receive data from a customer dll and they only support polling. Is there a way to add to the io_service a specific method to call once the io_service is running. I've included the ReceiveProcessSend.hpp with a comment above the two async_receive calls I need to replace. Also, below is a very basic example of how I setup classes that I pass into the ReceiveProcessSend. Any help on how to add calling methods to the io_service would be really appreciated. Ryan class DoSomeProcessing { private: typedef std::vector<unsigned char> t_ucvector; typedef boost::shared_ptr<t_ucvector> t_boostVector; typedef std::list<t_boostVector> t_boostList; public: t_boostList const processMessage(t_boostVector message, t_ucvector::size_type messageSize) { t_boostList outputList; //Do processing here and create output buffer. return outputList; } }; int main(int argc, char * argv[]) { DoSomeProcessing myProcess; ReceiveProcessSend::Arguments myArguments; boost::asio::io_service io_service; ReceiveProcessSend rps( io_service, boost::bind(&DoSomeProcessing::processMessage, &myProcess, _1, _2), myArguments); io_service.run(); return 0; }

1 0

Comparing two mpl::vector types
by Rodrigo Madera 23 Feb '13

23 Feb '13

Hello all, Can anyone give me a hint on how to call a functor on the differences of two same size mpl::vector types? For example, given: typedef boost::mpl::vector<int, char, short, double> v0_type; typedef boost::mpl::vector<int, int, short, std::string> v1_type; We can see that the second and third elements don't match, so I wish to call a functor twice, with the following signature: struct SomeFunctor { template <typename T, typename U> void operator()(T t, U u) const { // do something nice here } }; In this example, functor would be called twice: once with [T=char, U=int] and another with [T=short, U=std::string], along with their values. Thanks for any light, Rodrigo

2 2

Geometry buffer algorithm: complete or not?
by John Lilley 22 Feb '13

22 Feb '13

I was looking here: http://www.boost.org/doc/libs/1_52_0/libs/geometry/doc/html/geometry/refere… And saw this: "The current implemetation only enlarges a box, which is not defined by OGC. A next version of the library will contain a more complete implementation" It looks like Boost::Geometry is incapable of buffering an arbitrary polygon. But various forum discussions refer to the buffer() algorithm like it actually works for the general case. Which is correct? John Lilley

2 8

Building / installing only the geometry library
by John Lilley 22 Feb '13

22 Feb '13

Is there a recommended approach to building/installing only the geometry library and its required headers? I understand that geometry is header-only, so I don't really need the libraries at all, but the build process that I am seeing to move the headers to the target folder builds them anyway. I am trying to get a minimal checkin to our version control that contains only those headers needed for geometry. Thanks, john

2 2

[LockFree] a queue of std::shared_ptr?
by Scott Smedley 22 Feb '13

22 Feb '13

Hi all, Is it possible to store std::shared_ptr objects in a boost::lockfree::queue? eg. boost::lockfree::queue<std::shared_ptr<Message>> q; gcc 4.7.2 with Boost 1.53.0 is giving a static assertion failure. It wants: boost::has_trivial_destructor<T>::value and boost::has_trivial_assign<T>::value Any help would be muchly appreciated. Scott.

4 4

scope_lock question
by Jeff Dunlap 22 Feb '13

22 Feb '13

I plan to start using Boost Thread, but for now I have a multithreaded Win32 application that does not use boost. Although the threads were not created with Boost Thread, can I use boost::mutex::scoped_lock to protect some new functions I write for the app? Example: boost::mutex mutex; void whatever() { boost::mutex::scoped_lock lock(mutex); // will this be protected even though the // thread was not created using Boost? } Thank you

3 2

[Building] Weird crash on windows while trying to build boost
by Alessandro Stamatto 21 Feb '13

21 Feb '13

Hi, I'm trying to build Boost on windows 7, I'm using rubenv mingw+gcc-4.8 (from here: http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20W… ). I tried the usual way: "bootstrap gcc" and ".\b2". But at the beginning of the building process a weird crash happens with a windows message dialog of "Keyboard History Utility has stopped working". It happens even with the suppressing option ('-d0'). In the process list I see that this Keyboard Utility is called "doskey.exe". What is happening? Is it possible to build boost with gcc-4.8 on windows? Thanks for your attention, Alessandro Stamatto.

1 0

New gil::io has been added
by Christian Henning 21 Feb '13

21 Feb '13

Hi all, I have successfully replaced the old gil::io extension with the new gil::io. The new io has been developed on and off over the last few years and I believe it's a great improvement over the old one. Before going into details I like thank everyone that has been helping me out along the way. I have learned a lot of things and I'm very grateful for the experience! There are numerous improvements and perhaps it's best to study the documentation before using it. Here are some noteworthy points that come to my mind: * updating code that uses the old version only requires to change the header from "boost/extension/io/jpeg_io.hpp" to "boost/extension/io/jpeg/jpeg_io_old.hpp" * new formats: bmp, pnm, raw, targa * read numerous meta information from images. See boost/gil/extension/io/png_tags.hpp for example. * use all sorts of file metaphers or file names, like FILE*, ifstream, stringstream, wstring, filesystem::path, etc * in-memory images are supported * read large images with a scanline_read_iterator * have access to the file format backend * etc. There are some items left for which I need help from the boost maintainers. * How do I hook up the gil::io documentation so it's build when all boost documentation is build? * Same for the test suite. * Should I update boost_release? Or should the new extension "simmer" for a while? Again thanks for everything, Christian

2 1

time out for r_c_shortest_paths
by Brammert Ottens 21 Feb '13

21 Feb '13

Hi, I want to be able to put a time out on the r_c_shortest_paths, and still be able to get the optimal paths that have been found so far. Currently, I changed the REF such that it always returns false as soon as the time out has reach, in effect emptying the unprocessed_labels queue. The problem with this is that the algorithm still needs quite some time to actually empty the queue. I tried to have the on_label_popped(cur_label) throw an exception when the timeout has been reached. The timeout itself works like a charm, but because the pareto_optimal_solutions container is only filled after the while loop I can't access the already found optimal solutions. Does anybody have an idea on how to do this in a better way, without having to request an addition to the boost API? Regards, Brammert

2 1

upgrading lock
by Igor R 21 Feb '13

21 Feb '13

Hello, Just wanted to be sure that I'm doing this correctly. typedef boost::upgrade_lock<boost::shared_mutex> upgrade_lock; typedef boost::upgrade_to_unique_lock<boost::shared_mutex> upgrade_to_unique_lock; upgrade_lock readLock(mutex_); // accessing shared resources in read-only mode //... upgrade_to_unique_lock writeLock(readLock); // modifying shared resources Is the above correct? In particular, upgrade_lock acquires "read" lock in raii style (similarly to shared_lock), right? Thanks.

2 2

Re: [Boost-users] Can boost help me organize/parse lots of binary data?
by Gabriel Bizzotto 21 Feb '13

21 Feb '13

Chris, > class Item > { > virtual void Decode(istream& Stream) = 0; > } > class Double : public Item > class String : public Item > class EmployeePacket > { > std::vector<Item*> Items; ... Maybe boost::any will do better here ? http://www.boost.org/doc/libs/1_53_0/doc/html/any.html

2 1

[lockfree] compile-time capacity vs. run-time capacity
by Akira Takahashi 21 Feb '13

21 Feb '13

Hi, I confused with boost::lockfree::queue behavior. Fist, run-time capacity: #include <iostream> #include <boost/lockfree/queue.hpp> int main() { boost::lockfree::queue<int, boost::lockfree::fixed_sized<true>> que(3); std::cout << std::boolalpha; std::cout << que.push(1) << std::endl; // true std::cout << que.push(2) << std::endl; // true std::cout << que.push(3) << std::endl; // true std::cout << que.push(4) << std::endl; // false } I think this behavior is correct. But, compile-time capacity: #include <iostream> #include <boost/lockfree/queue.hpp> int main() { boost::lockfree::queue<int, boost::lockfree::capacity<3>> que; std::cout << std::boolalpha; std::cout << que.push(1) << std::endl; // true std::cout << que.push(2) << std::endl; // true std::cout << que.push(3) << std::endl; // false : why? std::cout << que.push(4) << std::endl; // false } Is this bug or specification? Thanks, Akira >>======================== Akira Takahashi mailto:faithandbrave@gmail.com site: https://sites.google.com/site/faithandbrave/about/en

1 1

Coroutine documentation question
by Brian Wood 21 Feb '13

21 Feb '13

I have a question about a sentence on this page: http://www.boost.org/doc/libs/1_53_0/libs/coroutine/doc/html/coroutine/intr… "The principal difference between coroutines and routines is that a coroutine enables explicit suspend and resume their progress via additional operations by preserving local state ..." I'm wondering if it would be accurate/helpful to change that to this: "The principal difference between coroutines and routines is that coroutines enable explicit suspend and resume of their progress via additional operations by preserving local state ..." Shalom Brian Wood Ebenezer Enterprises - so far G-d has helped us. http://webEbenezer.net (651) 251-9384

1 0

Boost.Geometry: Correct use of multi-part polygons
by John Lilley 20 Feb '13

20 Feb '13

Greetings, I am looking for some guidance around the correct creation and use of multi-part polygons. I am a bit confused about when to use each of the following: * Polygon with multiple rings * Vector of polygons * Polygon set * Set/vector of polygons, each potentially containing multiple rings I gather from this example picture: http://geometrylibrary.geodan.nl/03__polygon__example_8cpp-example.html That if one wants holes to be opened as a result of intersection, they need to be rings as opposed to polygon sets or vectors of polygons? An example would be polygon(s) representing an island chain. Some of the islands are atolls and as such have a hole in the middle. What would a representation of this set of islands look like? And, what If I don't know if I have "real" rings (interior) vs just a collection of polygons (like I got this from an external source that doesn't have the same model). If I just throw a pile of points at a polygon and call clean(), will that magic everything up for me? john

2 4

Boost.geometry intersection / difference question
by John Lilley 20 Feb '13

20 Feb '13

What types are the intersection and difference algorithms implemented for? In particular: Can polygons intersect with non-polygons (e.g. point sets to produce clipped point sets, or linestrings to produce clipped linestrings)? Similar question for difference, where polygon is the second input. Thanks John

2 1

Re: [Boost-users] [Atomic] [Tread] Proposal for Synchronized<T>
by Gabriel Bizzotto 20 Feb '13

20 Feb '13

Hi, > I've been working already on a synchronized_value class that is in trunk [1]. I plan to merge it to release branch as soon as I have finished the tests and the documentation. You can see some examples in [2] and [3]. > I've take a look to your class and I think my class provides everything yours provide. Surely your version has been given more thought. > My class allows in addition to lock several synchronized values using the deadlock free lock algorithm as e.g. I did not understand the unique_synchronize part, though. > Please could you compare your class to mine and let me know what do you think? I can't see any flaw right now, but I'm still playing with it. If anything shows up I'll let you know. Thanks !

2 1

Re: [Boost-users] [Atomic] [Tread] Proposal for, Synchronized<T>
by Gabriel Bizzotto 20 Feb '13

20 Feb '13

> I have one that does reader/writer locking. I'll pass it along for comparison along with design notes (it was done partially for teaching), if it's OK to send a zip file to you. > ?John Sure, let's take a look ! You also want to carbon-copy to vicente.botet(a)wanadoo.fr, which is putting the finishing touch on the future boost::synchronized_value.

2 1

Directed cycle detection in a DAG between two nodes
by Amanullah Yasin 20 Feb '13

20 Feb '13

Hi, In Hill Climbing algorithm, before applying an operation "add_edge", "reverse_edge" or "remove_edge", I need to check whether the graph will be a Directed Acyclic Graph (DAG) or not. So there is recursive function but in some cases it goes in infinite loop and gives "stack overflow" error. //======= Function ======= bool myAlgo::remainsADAG(const Node_type& nodeInit, const Node_type& node, const Graph_type& graph) { graph_traits<Graph_type>::adjacency_iterator vi, vi_end; tie(vi, vi_end) = adjacent_vertices(node, graph); for (; vi != vi_end; ++vi) { if ((*vi == nodeInit) || (!remainsADAG(nodeInit, *vi, graph))) return false; } return true; } ============== e.g. for Graph 12->19->20->23 19->24->31->18>19 18->32 To test if there is a directed path between v12 and v32 it goes as: 12->19->20->23 24->31->18>19 *There is an infinite loop{18->19->20->23, 24->31->18}.* ================= Can some one help me or is there any other easy way to find a directed path between two nodes in boost graph? Thanks in advance. YASIN

4 3

[Preprocessor] Generate #include directive with preprocessor
by Adam Badura 20 Feb '13

20 Feb '13

Is it possible to use preprocessor to generate #include directives (or in any other way include the files)? For example if I would have a sequence of strings (being file paths) what to do to include all those files? It is possible at all?

4 3

Sperical / geo coordinates question: crossing anti-meridian
by John Lilley 19 Feb '13

19 Feb '13

I am trying to determine if boost.geometry handles certain cases of spherical coordinates. Suppose you have county outlines of Alaska. The Aleutian Islands chain crosses the anti-meridian, and so contains latitudes that are in the ranges [ 180 - delta ... 180 ] and [ -180, -180 + delta ] where delta is < 20 degrees or so. Simple (2D planar) point-in-polygon and polygon intersection algorithms fall down on these cases due to anti-meridian crossings and flipping between +/- values. Does Boost geometry deal with these issues "correctly"? I put correctly in quotes because there is some real ambiguity in the coordinate system (maybe the polygon really does wrap around the world?), but one could apply a "minimum perimeter" heuristic and normalize the polygons before performing the computation by moving the [ 180 - delta ... 180 ] range over to [ -180 - delta ... -180 ] or vice-versa. Thanks, john

2 2

[Atomic] [Tread] Proposal for, Synchronized<T>
by John M. Dlugosz 19 Feb '13

19 Feb '13

On 2/19/2013 4:02 PM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > Subject: Re: [Boost-users] [Atomic] [Tread] Proposal for > Synchronized<T> > Message-ID:<5123C32D.9020700(a)wanadoo.fr> > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" > > Le 19/02/13 17:58, Gabriel Bizzotto a ?crit : >> >Hi ! >> > >> >I've created two simples classes that helped me avoid data races when >> >sharing objects among threads. >> > >> >The idea is to declare objects that need for synchronization as >> >Synchronized<T>, which holds a T and a mutex. To use the T, a Get >> >function has to be called that returns a proxy, which holds a pointer >> >to the T and a scoped lock on the mutex. The proxy defines operator-> >> >and operator* to give access to the T. To have acces to the T, one has >> >to create the proxy. As long as the proxy exists, the mutex associated >> >with the T is locked, effectively preventing use by other threads. I have one that does reader/writer locking. I'll pass it along for comparison along with design notes (it was done partially for teaching), if it's OK to send a zip file to you. —John

1 0

[property_map] constructor of vector_property_map
by Andreas Fabri 19 Feb '13

19 Feb '13

Hello, Why is initial_size in the constructor __________________________________________________________________ vector_property_map(unsigned initial_size, const IndexMap& index = IndexMap()) This constructor version allows to specify maximum index of element that will be stored. Correct number will improve performance, but semantic is always the same. Source: http://www.boost.org/doc/libs/1_53_0/libs/property_map/doc/vector_property_… __________________________________________________________________ not std::size_t, for the simple reason that the std::vector might be bigger. best regards, andreas -- Andreas Fabri, PhD Chief Officer, GeometryFactory Editor, The CGAL Project phone: +33.492.954.912 skype: andreas.fabri

2 1

compiling error from code using boost::bind code in Vs2010
by Miguel Carvajal 19 Feb '13

19 Feb '13

hello, actually i am using boost 1.48 on vs2010 and the following code does not compile on boost #include<boost/bind.hpp> #include<boost/function.hpp> using namespace boost; class A { public: void evaluate(function<VectorClass(VectorClass,double)> f) }; class B { A a; public; VectorClass f(VectorClass,double); void test() { a.evaluate(bind(f,this,_1,_2)); } }; Any help?

2 1

[Atomic] [Tread] Proposal for Synchronized<T>
by Gabriel Bizzotto 19 Feb '13

19 Feb '13

Hi ! I've created two simples classes that helped me avoid data races when sharing objects among threads. The idea is to declare objects that need for synchronization as Synchronized<T>, which holds a T and a mutex. To use the T, a Get function has to be called that returns a proxy, which holds a pointer to the T and a scoped lock on the mutex. The proxy defines operator-> and operator* to give access to the T. To have acces to the T, one has to create the proxy. As long as the proxy exists, the mutex associated with the T is locked, effectively preventing use by other threads. For more details and examples, I've already published the classes here http://codereview.stackexchange.com/questions/15632/force-locking-for-threa… I find the scheme general purpose enough to fit the Atomic lib, or perhaps Thread. Please manifest yourselves if there is any interest in such device. Thx. Gabriel ++++++[>+++[>++++>++++++<<-]<-]>>-.>---.-------..>++++[<++++>-]<+. WebRep Classificação geral Este site não tem classificação (número de votos insuficientes) WebRep Classificação geral Este site não tem classificação (número de votos insuficientes) WebRep Classificação geral Este site não tem classificação (número de votos insuficientes) WebRep Classificação geral Este site não tem classificação (número de votos insuficientes) WebRep Classificação geral Este site não tem classificação (número de votos insuficientes) WebRep Classificação geral Este site não tem classificação (número de votos insuficientes) WebRep Classificação geral Este site não tem classificação (número de votos insuficientes) WebRep Classificação geral Este site não tem classificação (número de votos insuficientes) WebRep Classificação geral Este site não tem classificação (número de votos insuficientes)

3 2

[Property Tree] special character in XML tag
by Gábor Márton 19 Feb '13

19 Feb '13

Hi, I have the following property tree, dumped in INFO format: CudbAppServiceId=1 { userLabel "" sqlAppSrvPlSchema identities-pl.sql CudbAppServiceId CudbAppServiceId=1 } When I dump it in XML format, I got the following: <?xml version="1.0" encoding="utf-8"?> <CudbAppServiceId=1> <userLabel/> <sqlAppSrvPlSchema>identities-pl.sql</sqlAppSrvPlSchema> <CudbAppServiceId>CudbAppServiceId=1</CudbAppServiceId> </CudbAppServiceId=1> This is not a valid XML, because we have a tag "CudbAppServiceId=1". Of course, any other xml parser like xmllint will fail to parse it, because of the equality sign in the tag. Is there any solution to this problem? Like somehow emitting = instead of the raw '=' inside the tag and in the text? Thanks, Gabor

3 7

chaining functions input output
by MM 19 Feb '13

19 Feb '13

Hello, i have these 2 functions provided to me and I wonder whether they can somehow be chained without using intermediary memory? http://codepad.org/tTwkUQhp Rds, MM

4 7

[Lockfree] Interprocess Support
by Gábor Márton 19 Feb '13

19 Feb '13

Hi, In 1.53 documentation it is said: The boost.lockfree data structures have basic support for Boost.Interprocess. The only problem is the blocking emulation of lock-free atomics, which in the current implementation is not guaranteed to be interprocess-safe. What does that and interprocess-safety exactly mean? Is it possible to use an interprocess allocator (e.g. allocator<int, managed_shared_memory::segment_manager>) together with lockfree::queue? Or shall I expect unexpected behaviour? Thanks, Gabor

1 0

Thread safety in Boost msm
by Ukil, Soumya P 18 Feb '13

18 Feb '13

Hi, I am new to boost meta state library. I am building one app, where I have to use msm. My application has two threads, where they use same msm object as a shared resources. Now will the msm be thread safe if both threads call process_event on the same msm object? Any idea is welcome. Thanks, Soumya P. Ukil Morgan Stanley | ISG Technology Building #5. Sector 30 | Mindspace, Goregaon (West) Mumbai (Ex Bombay), 400 090 Phone: +91 22 6641-0038 Soumya.Ukil(a)morganstanley.com<mailto:Soumya.Ukil@morganstanley.com> Be carbon conscious. Please consider our environment before printing this email. ________________________________ NOTICE: Morgan Stanley is not acting as a municipal advisor and the opinions or views contained herein are not intended to be, and do not constitute, advice within the meaning of Section 975 of the Dodd-Frank Wall Street Reform and Consumer Protection Act. If you have received this communication in error, please destroy all electronic and paper copies and notify the sender immediately. Mistransmission is not intended to waive confidentiality or privilege. Morgan Stanley reserves the right, to the extent permitted under applicable law, to monitor electronic communications. This message is subject to terms available at the following link: http://www.morganstanley.com/disclaimers If you cannot access these links, please notify us by reply message and we will send the contents to you. By messaging with Morgan Stanley you consent to the foregoing.

2 1

[Boost.Coroutine] sample in docs
by Lukas Czaja 18 Feb '13

18 Feb '13

Hi, i would like to ask about sample in docs http://www.boost.org/doc/libs/1_53_0/libs/coroutine/doc/html/coroutine/intr… what if several threads run asio::io_service::run(), so is it safe to resume execution state in CompletionHandler in diffrent thread from when execution state was saved ? And what will happen if io_service completes before saving contex (look code below)? s_.async_read_some( boost::asio::buffer( buffer_ + pb_size, bf_size - pb_size), boost::bind( & coro_t::operator(), & coro_, _1, _2) ); // Q: what will happen if handler completes here, before contex switch ca_();

1 0

[Interprocess] managed_shared_memory between 32 & 64bit
by leunm 17 Feb '13

17 Feb '13

Hi, I am new to Boost and am looking for a way to pass xyz coordinates from a 32-bit application to a 64-bit one. I see two recent posts on this same topic, but the explanation, as well as the Boost documentation (on offset_ptr) is a bit sparse. Below is a simple example I modified from the Boost documentations <http://www.boost.org/doc/libs/1_53_0/doc/html/interprocess/quick_guide.html…> , which works for either 32-bit or 64-bit but not when the parent is 32-bit and child is 64-bit, and vice versa. Can someone tell me what I need to do enable this function? Thank you in advance, Mike ----------------------------------------------------------------- #define BOOST_DATE_TIME_NO_LIB #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/containers/vector.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <string> #include <cstdlib> //std::system #include <conio.h> #include <iostream> #include <windows.h> using namespace boost::interprocess; //Define an STL compatible allocator of ints that allocates from the managed_shared_memory. //This allocator will allow placing containers in the segment typedef allocator<float, managed_shared_memory::segment_manager> ShmemAllocator; //Alias a vector that uses the previous STL-like allocator so that allocates //its values from the segment typedef vector<float, ShmemAllocator> MyVector; //Main function. For parent process argc == 1, for child process argc == 2 int main(int argc, char *argv[]) { if(argc == 1){ //Parent process //Remove shared memory on construction and destruction struct shm_remove { shm_remove() { shared_memory_object::remove("MySharedMemory"); } ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); } } remover; //Create a new segment with given name and size managed_shared_memory segment(create_only, "MySharedMemory", 65536); //Initialize shared memory STL-compatible allocator const ShmemAllocator alloc_inst (segment.get_segment_manager()); //Construct a vector named "MyVector" in shared memory with argument alloc_inst MyVector *myvector = segment.construct<MyVector>("MyVector")(alloc_inst); for(int i = 0; i < 100; ++i) //Insert data in the vector myvector->push_back(0.0); // Loop bool exitFlag = false; while (1) { // Store 3 values myvector->at(0) = rand() % 100; myvector->at(1) = rand() % 100; myvector->at(2) = rand() % 100; std::cout << "Parent: " << myvector->at(0) << ", " << myvector->at(1) << ", " << myvector->at(2) << std::endl; if (kbhit()) { switch (getch()) { default: exitFlag = true; break; } if (exitFlag) break; } Sleep(500); } //When done, destroy the vector from the segment segment.destroy<MyVector>("MyVector"); } else { //Child process //Open the managed segment managed_shared_memory segment(open_only, "MySharedMemory"); //Find the vector using the c-string name MyVector *myvector = segment.find<MyVector>("MyVector").first; //Loop bool exitFlag = false; while (1) { try { std::cout << "Child: " << myvector->at(0) << ", " << myvector->at(1) << ", " << myvector->at(2) << std::endl; } catch (...) { std::cout << "Error accessing vector, exiting..." << std::endl; exitFlag = true; } if (kbhit()) { switch (getch()) { default: exitFlag = true; break; } } if (exitFlag) break; Sleep(500); } } return 0; }; -- View this message in context: http://boost.2283326.n4.nabble.com/Interprocess-managed-shared-memory-betwe… Sent from the Boost - Users mailing list archive at Nabble.com.

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Behaviour of asio
by ustulation 17 Feb '13

17 Feb '13

By going through the doc. i understand that async completion handlers will be called whenever io_service::run() reads posted events from the queue for which the corresponding handlers were registered by us. Now if i have a registered handler for some event (say async_wait() of deadline_timer) which does something time consuming, then event loop (io_service::run()) does not get a chance to read the event queue until the handler returns thus preventing calls to other handlers for which events are queued. I've tested this behaviour with timers and it works as expected. However i could not understand the behaviour of async_read_from() of udp::socket. void A::read() { udpSoc.async_receive_from( boost::asio::buffer(m_cRxData, 1024), m_endpoint, boost::bind(&A::readHandler, this, _1, _2) ); } ////////////////////////////// <1> /////////////////////////// void A::readHandler(......) { std::string szDatagram(m_cRxData, bytesReceived); std::cerr << "Rxd Datagram: " << szDatagram << std::endl; read(); //............ } ////////////////////////////// <2> /////////////////////////// void A::readHandler(......) { read(); std::string szDatagram(m_cRxData, bytesReceived); std::cerr << "Rxd Datagram: " << szDatagram << std::endl; //............ } in above when 2 datagrams arrive simultaneously, readHandler <1> works fine but <2> does not. In <1> std::cerr write 1st and 2nd Datagrams distinctly, but in <2> data gets corrupted and std::cerr writes a string that would be formed if the 1st datagram in it were overwritten by the 2nd datagram (ie., if 1st one was 12345 and 2nd one xyz then <2> above prints "xyz45".) This means that clearly m_cRxData (which is a private member) is getting overwritten. Why does this happen? async_read_from should return immediately without reading into m_cRxData, readHandler(..) should continue and complete, and control should reach event loop, and then finally async read should be done calling the completion handler. Is this explanation wrong? -- View this message in context: http://boost.2283326.n4.nabble.com/Behaviour-of-asio-tp4642911.html Sent from the Boost - Users mailing list archive at Nabble.com.

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Re: [Boost-users] Question about installing and using boost library.
by Giovanni 16 Feb '13

16 Feb '13

Greetings Pan, I am using Ubuntu 12.04 with one of my machines. I used the Ubuntu Software Center to install the Boost C++ Libraries, which makes things so much easier. You can enter "Boost" into the search box on the top-right corner, and find the Boost C++ Libraries to install. There are a number of them, including versions that conflict with each other. I chose the default version, and packages that don't conflict with that. I suggest that you install Boost C++ that way. After you have installed Boost C++ with Ubuntu Software Center, you should/"should" (it depends on how you set things up and if you have root access) see the following. The collection of header files for the Boost C++ Libraries in the location: /usr/lib. The collection of dynamic libraries (to be dynamically linked) for the Boost C++ Libraries in the location: /usr/include/boost. To test if you have installed the Boost C++ Libraries correctly, run a very simple C++ program that includes one of the Boost C++ Libraries and calls a function from that library. For example, you can try my attached toy program. To compile and run the program, try: g++ -o static2.out get_sys_info.cpp -lboost_filesystem -lboost_system ./static2.out As for your specific problem, I am guessing that it is a linking error that I also had. You need to include the Boost C++ Libraries at the end of the compilation command (for GCC/g++). Hence, I placed the filename (C++ source file) before including the libraries. I suggest that you post your compilation/linking commands, or makefile or script for build automation, so that people can help you. In addition, I would include the relevant source code (make it a simple C++ program, like my example) to test your Boost C++ installation. Furthermore, I would include the transcript from the Terminal. Just copy and paste what appears on the Terminal as you compile the program. Good luck, and have a great weekend! Regards On Fri, Feb 15, 2013 at 8:47 AM, pan yi <outlook_eye(a)yahoo.com.cn> wrote: > Hi all, > > I'm a beginner to use boost library for my c++ coding project. After I > include the <boost/algorithm/string.hpp> in my cpp file and compile the > code, the compiling error indicates that: > fatal error: boost/algorithm/string.hpp: No such file or directory > I search on internet and knows that I need to install some boost library. > But which library should I install? (I tried to install the whole library > with "sudo apt-get install libboost*", but it doesn't work.) > > Can any one help me? I'm compiling and executing c++ on ubuntu Version12.04 > environment > > Thank you so much. > > Best Regards > Pan

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Re: [Boost-users] [Chrono] Memory leak in Chrono?
by Don 16 Feb '13

16 Feb '13

On 2/16/2013 Vincent wrote: > Please, could you create a Trac ticket so this issue not lost? Submitted as ticket #8079 https://svn.boost.org/trac/boost/ticket/8079 Thanks, Don

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Re: [Boost-users] [Chrono] Memory leak in Chrono?
by Don 16 Feb '13

16 Feb '13

-------- Original Message -------- Subject: Boost-users Digest, Vol 3358, Issue 4 From: boost-users-request(a)lists.boost.org To: boost-users(a)lists.boost.org Date: 2/13/2013 1:33 PM > Subject: Re: [Boost-users] [Chrono] Memory leak in Chrono? > From: "Vicente J. Botet Escriba" <vicente.botet(a)wanadoo.fr> > Date: 2/13/2013 1:11 PM > > Le 13/02/13 14:30, Don a écrit : >>> Subject: Re: [Boost-users] [Chrono] Memory leak in Chrono? >>> From: "Vicente J. Botet Escriba" <vicente.botet(a)wanadoo.fr> >>> Date: 2/12/2013 1:17 PM >>> >>> Le 12/02/13 18:13, gast128 a écrit : >>>> we use Boost.Chrono too. MFC applications incorrectly report memory leaks, which can easily be solved. >>> Hi, >>> >>> if you have some patches to propose to avoids this incorrect reports I would try to include them. >> >> Vincente, >> >> I am using MFC, but I don't believe this is a MFC false-leak report. >> >> I added a destructor for duration_units_default_initializer_t, like this (near the end of chrono/io/duration_units.hpp): >> >> ~duration_units_default_initializer_t() >> { >> if (duration_units_default_holder<CharT>::initialized_) >> { >> delete[] duration_units_default_holder<CharT>::n_d_valid_units_; >> duration_units_default_holder<CharT>::n_d_valid_units_ = 0; >> delete[] duration_units_default_holder<CharT>::valid_units_; >> duration_units_default_holder<CharT>::valid_units_ = 0; >> duration_units_default_holder<CharT>::initialized_ = false; >> } >> } >> >> This solves the memory leak, and seems to work fine for my simple test program. > I could add this is this helps on the MFC report. Thanks, that would be useful. It would probably help with other memory leak detectors, as well. Since you are allocating heap that you are never freeing, most leak detectors are going to report this. >> But n_d_valid_units_, valid_units_, and initialized_ are static >> variables, so I assume you want to only create these variables >> once. > > Right. > >> When run with my test program and step through it in the debugger, >> only one instantiation of duration_units_default_initializer_t >> occurs. (That is, once for each char type, single-byte and wide.) > This is the goal of the type (implement a singleton). This technique > is used in some Boost libraries already > >> This occurs when the duration_units_default_initializer is >> instantiated (at the very end of duration_units.hpp). Since this is >> a global variable, this occurs during application startup and the >> destructor runs during application shuttdown. > > Right, this was the reason the destructor didn't do anything. >> >> But presumably this can occur in some other situations, otherwise >> why would you have all the logic of making valid_units_ etc. >> class-static variables.> > On which other situation do you think this could occur? I have no idea, that's what confused me. If duration_units_default_initializer_t is only instantiated as a global (static) variable), then I don't see any reason for making n_d_valid_units_, valid_units_, and initialized_ static variables -- they could be regular member variables. Making them static doesn't hurt, but it's confusing (to me at least) because it looks like you want to share those variables among multiple instantiations, and there is only ever one instantiation. If one can somehow instantiate multiple duration_units_default_initializer_t objects, then making the member variables static does make this behave as a singleton. In that case the simple destructor I wrote will not work, since it will delete the member variables when the first object destructs, not the last. In that case I would use a reference count or smart pointers to only delete when the final object destructs. Thanks for your help, I appreciate your spending the time to answer my questions. Don

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[Asio] How to implement my own TCP?
by Chengu Wang 16 Feb '13

16 Feb '13

Hi all, I'd like to implement the TCP over UDP, because I want to change TCP a little. The implementation includes the three-way handshake, retransmission, etc. My TCP must have the basic interfaces as the original TCP does, i.e. a my_tcp::acceptor class supporting bind, listen, accept, async_accept and close, and a my_tcp::socket supporting bind, connect, async_connect, send, async_send, receive, async_receive and close. Of course I can write these two classes from scratch, but can I do it in the framework of asio and reuse some codes of asio? What classes should I implement and what do the inherit from? Any help would be appreciated. -- Best, Chengu Wang

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Ideas for UT needed
by Olaf Peter 15 Feb '13

15 Feb '13

Hello, for my project I use the ideas used on spirit's conjure2 example. Now I like to do some test with the lexer/grammar using boost::test. The example uses sequentially initializing all iterators, lexer and grammar. I like to put this into the fixture but I run into the problem that the error_handler requires begin/end of iterator. ---8<--- original from conjure2 main typedef std::string::const_iterator base_iterator_type; typedef client::lexer::conjure_tokens<base_iterator_type> lexer_type; typedef lexer_type::iterator_type iterator_type; lexer_type lexer; // Our lexer base_iterator_type first = source_code.begin(); base_iterator_type last = source_code.end(); iterator_type iter = lexer.begin(first, last); iterator_type end = lexer.end(); client::error_handler<base_iterator_type, iterator_type> error_handler(first, last); // Our error handler client::parser::function<iterator_type, lexer_type> function(error_handler, lexer); // Our parser --->8--- My fixture looks so far: ---8<--- typedef std::string::const_iterator base_iterator_type; typedef my_tokens<base_iterator_type> lexer_type; typedef lexer_type::iterator_type iterator_type; typedef error_handler<base_iterator_type, iterator_type> error_handler_type; struct fixture : private boost::base_from_member<error_handler_type>, private boost::base_from_member<lexer_type>, my_grammar<iterator_type, lexer_type> { typedef boost::base_from_member<lexer_type> lexer_base; typedef boost::base_from_member<error_handler_type> error_handler_base; typedef my_grammar<iterator_type, lexer_type> grammar_base; fixture() : grammar_base(error_handler_base::member, lexer_base::member) { } }; --->8--- error_handler_base::member requires therefore the iterators first/last. How to give them? In the UT I have further a "test" function object so I can use e.g. it like here: ---8<--- BOOST_FIXTURE_TEST_SUITE(parameter_test, fixture) BOOST_AUTO_TEST_CASE(my_test) { BOOST_CHECK(test(rule_to_test, "input to parse", "expected output")); } --->8--- The next problem is related to the original use case. conjure2 is design as a compiler: initialize, analyse, generate and exit - no reuse of the grammar. I like to instance the grammar once (static) and use it several times using the qi::parse function. Since the iterators are fixed, they can't be changed later to point to other sources, isn't it? Is this the right approach for my problem? Thanks, Olaf

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Re: [Boost-users] [LockFree] a queue of std::shared_ptr?
by chris 15 Feb '13

15 Feb '13

Hello All, If we can't use shared_ptr in a lockfree queue, how can I share data between different queue ? I have some data that I have to be put in different queues and I want to avoid that I have to copy this data for each queue. -- View this message in context: http://boost.2283326.n4.nabble.com/LockFree-a-queue-of-std-shared-ptr-tp464… Sent from the Boost - Users mailing list archive at Nabble.com.

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Question about installing and using boost library.
by pan yi 15 Feb '13

15 Feb '13

Hi all, I'm a beginner to use boost library for my c++ coding project. After I include the <boost/algorithm/string.hpp> in my cpp file and compile the code, the compiling error indicates that: fatal error: boost/algorithm/string.hpp: No such file or directory I search on internet and knows that I need to install some boost library. But which library should I install? (I tried to install the whole library with "sudo apt-get install libboost*", but it doesn't work.) Can any one help me? I'm compiling and executing c++ on ubuntu Version12.04 environment Thank you so much. Best Regards Pan

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Re: [Boost-users] Boost-users Digest, Vol 3359, Issue 1
by John M. Dlugosz 14 Feb '13

14 Feb '13

On 2/14/2013 2:26 AM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > Message: 5 > Date: Wed, 13 Feb 2013 19:20:40 -0500 > From: Edward Diener<eldiener(a)tropicsoft.com> > To:boost-users@lists.boost.org > Subject: Re: [Boost-users] [Preprocessor] Generate #include directive > with preprocessor > Message-ID:<kfhaku$ikt$1(a)ger.gmane.org> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 2/13/2013 6:43 AM, Adam Badura wrote: >> >Is it possible to use preprocessor to generate #include directives (or >> >in any other way include the files)? > No it is not possible. You cannot define a macro which expands to other > another macro definition or any other basic preprocessor construct, > including the #include. > > It is possible to use a macro as the name of the file to include. So you can choose the file via preprocessing logic, but not alter the fact that some file is to be included. So... given an empty file and a file with #include M1 #include M2 you can use recursion to include an arbitrary number of different files based on preprocessor logic. --John

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[GIL] About `packed_channel_value` (possible improvement)
by TONGARI 14 Feb '13

14 Feb '13

Hi, I took a look into "channel.hpp" and found that packed_channel_value is not very efficient in construction. There are: packed_channel_value(integer_t v) { _value = static_cast< integer_t >( v % num_values ); } // I have no idea why this exists, seems OK to remove it template <typename Scalar> packed_channel_value(Scalar v) { _value = static_cast< integer_t >( v ) % num_values; } IIUC, "v % num_values" above could be replaced with a much cheaper "v & low_bits_mask_t<NumBits>::sig_bits_fast". That is: packed_channel_value(integer_t v) : _value(v & low_bits_mask_t<NumBits>::sig_bits_fast) {} What do you think? Am I missing some point? Thanks.

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[ASIO] Any HTML5 video streaming server with boost asio?
by Goran 14 Feb '13

14 Feb '13

Hi all, do anybody knows something about HTML5 video streaming with boost::asio? I've looked into the tutorials and would like to use the html server examples to integrate into my app. So far anything is clear but video streaming is something I've never done. Are any resources out there? Thanks in advance! G.

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Documentation Install
by Robert Patterson 14 Feb '13

14 Feb '13

I download a tar ball, configured, built and installed (thank you). I then removed the entire build tree and realised I no longer had the docs (linked via libs/index.html). Obviously I can explode the tar ball again, but is there a simple way of keeping the docs without the whole tree - something like ./make installdocs ? Thanks Robert Patterson

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Re: [Boost-users] Boost.Move BOOST_MOVABLE_BUT_NOT_COPYABLE macro
by luke 14 Feb '13

14 Feb '13

(13/02/14 5:57), Ion Gaztañaga wrote:> El 13/02/2013 6:36, luke escribió: >> As deleting the copy constructor fixes the issue (i.e. test(test const&) >> =delete;), would it be at all possible for >> BOOST_MOVABLE_BUT_NOT_COPYABLE to do the same for compilers that support >> the syntax? > > Thanks for reporting it. It's already done. See: > > https://svn.boost.org/trac/boost/ticket/7969 > > If you can confirm the issue is fixed in trunk, I'll close the bug. > > Best, > > Ion Ah I guess I should have checked there first, sorry! http://svn.boost.org/svn/boost/trunk/boost/move/core.hpp works perfectly for me, thanks. Luke

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Boost.Move BOOST_MOVABLE_BUT_NOT_COPYABLE macro
by luke 13 Feb '13

13 Feb '13

Due to GCC 4.7.2 and lower not supporting a change in template deduction rules as explained in the answer below http://stackoverflow.com/questions/14808663/stdunordered-mapemplace-issue-w… the following code will not compile: #include <utility> class test { public: test() =default; private: test(test const&); }; int main() { std::is_convertible<test&, test>::value; }; For the same reason, it is not possible to use classes which use the BOOST_MOVABLE_BUT_NOT_COPYABLE in situations where libstdc++ uses std::is_convertible, for instance when using piecewise construction in std::unordered_map::emplace() (I came across the issue when making an unordered_map of boost::file_mapping) As deleting the copy constructor fixes the issue (i.e. test(test const&) =delete;), would it be at all possible for BOOST_MOVABLE_BUT_NOT_COPYABLE to do the same for compilers that support the syntax?

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[Contract] Eagerly waiting...
by Robert Jones 13 Feb '13

13 Feb '13

Hi Lorenzo (or anyone who knows) AFAICS your contract library seems to have been approved for a while, but not made it into a release. Do you have an ETA for this? Thx, Rob.

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Communication between QThread and boost threads
by ustulation 13 Feb '13

13 Feb '13

The Gui is in Qt and Api is in boost. The Gui is meant to sit on top of Api. One of the functions of Api is to do network level data management, process data in certain ways and communicate with the Gui (ie., bridge Gui with other end of Api). To keep the GUI from freezing Api does it's work in a separate thread. If both Gui and Api had used Qt, communication would have been easier with cross-threaded signal-slot mechanism of Qt. Api emits and returns immediately and vice-versa. So none would be blocked unless explicitly specified (*Qt::BlockingQueuedConnection*). I've been using boost only since a while back as it was required to code new Api in boost. How do i achieve this mechanism in *boost <--> Qt communication*? Api is going to be header+static_library and so Gui and Api will produce single executable. I have to support Linux, Windows and Mac minimum. -- View this message in context: http://boost.2283326.n4.nabble.com/Communication-between-QThread-and-boost-… Sent from the Boost - Users mailing list archive at Nabble.com.

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Re: [Boost-users] [Chrono] Memory leak in Chrono?
by Don 13 Feb '13

13 Feb '13

> Subject: Re: [Boost-users] [Chrono] Memory leak in Chrono? > From: "Vicente J. Botet Escriba" <vicente.botet(a)wanadoo.fr> > Date: 2/12/2013 1:17 PM > > Le 12/02/13 18:13, gast128 a écrit : >> we use Boost.Chrono too. MFC applications incorrectly report memory leaks, which can easily be solved. > Hi, > > if you have some patches to propose to avoids this incorrect reports I would try to include them. Vincente, I am using MFC, but I don't believe this is a MFC false-leak report. I added a destructor for duration_units_default_initializer_t, like this (near the end of chrono/io/duration_units.hpp): ~duration_units_default_initializer_t() { if (duration_units_default_holder<CharT>::initialized_) { delete[] duration_units_default_holder<CharT>::n_d_valid_units_; duration_units_default_holder<CharT>::n_d_valid_units_ = 0; delete[] duration_units_default_holder<CharT>::valid_units_; duration_units_default_holder<CharT>::valid_units_ = 0; duration_units_default_holder<CharT>::initialized_ = false; } } This solves the memory leak, and seems to work fine for my simple test program. But n_d_valid_units_, valid_units_, and initialized_ are static variables, so I assume you want to only create these variables once. When run with my test program and step through it in the debugger, only one instantiation of duration_units_default_initializer_t occurs. (That is, once for each char type, single-byte and wide.) This occurs when the duration_units_default_initializer is instantiated (at the very end of duration_units.hpp). Since this is a global variable, this occurs during application startup and the destructor runs during application shuttdown. But presumably this can occur in some other situations, otherwise why would you have all the logic of making valid_units_ etc. class-static variables. I don't think I understand enough about what is going on to propose a robust solution. Thanks for your help, Don

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boost::thread include order error
by Rob Patro 13 Feb '13

13 Feb '13

Hi, I noticed that when I don't include <boost/thread/thread.hpp> before the standard library includes, I get the following errors: In file included from /fs/szattic-asmg6/rob/dist/include/boost/thread/lock_types.hpp:14:0, from /fs/szattic-asmg6/rob/dist/include/boost/thread/pthread/thread_data.hpp:12, from /fs/szattic-asmg6/rob/dist/include/boost/thread/thread.hpp:17, from /fs/szattic-asmg7/rob/countseq/include/iterative_optimizer.hpp:26, from /fs/szattic-asmg7/rob/countseq/src/sailfish.cpp:33: /fs/szattic-asmg6/rob/dist/include/boost/thread/lockable_traits.hpp:90:37: error: expected identifier before ‘*’ token /fs/szattic-asmg6/rob/dist/include/boost/thread/lockable_traits.hpp:114:37: error: expected identifier before ‘*’ token However, when I move the boost thread include to the top of the set of included headers (above the standard library), the program compiles and runs correctly. What is the reason for this frustrating requirement? Is it possible to eliminate this behavior, so that <boost/thread/thread.hpp> can be included anywhere (or at least after the standard library) ? Thanks, Rob

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[Preprocessor] How to work around empty sequence?
by Adam Badura 13 Feb '13

13 Feb '13

I was using sequences happily until I realized that quite often I will have an empty collection. Yet empty sequences are not supported. So I switched to lists. But they are syntactically so much worse! You have to add that BOOST_PP_NIL. You have to take care of proper nesting of elements. Much less readable and editable in my opinion. This made me consider going back to sequences after all and requiring user to provide some kind of special symbol for empty sequence or end eery sequence with a fixed item so that I will now it is end and not a real item. In my opinion the extra effort would still be less than with the lists while overall "user experience" would be better. (At the expense of complicating my own code - but I'm ready to accept that.) Does anyone of you ever did something like that? Guidelines? Ideas? How do sequence function deal with empty sequences? If I would pass to BOOST_PP_SEQ_ENUM a result of BOOST_PP_SEQ_POP_FRONT on a single-element sequence would it work fine (enumerate nothing)? Or it is not guaranteed?

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some questions about boost.log & boost.process
by niXman 13 Feb '13

13 Feb '13

For my project I needed a logger and the ability to run/manage processes. Since the project will use boost, I do not want to drag into it external libraries. I googled boost.process[1] and boost.log[2][3], and I have three questions: 1) whether these libraries are suitable for use in real projects? have anyone used them? 2) do I understand correctly that the boost.process library does not have open CVS? 3) do I understand correctly that for the boost.log library I should use bleeding-edge branch? Thanks. -- Regards, niXman ___________________________________________________ Dual-target(32 & 64-bit) MinGW compilers for 32 and 64-bit Windows: http://sourceforge.net/projects/mingwbuilds/ ___________________________________________________ Another online IDE: http://liveworkspace.org/

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How to search multi_index container using composite key with date ranges
by Jeff 13 Feb '13

13 Feb '13

Hi, I am having syntax issues and wish to search a bmi container by the composite index defined below. I have read about boost::lambdas and understand how they work. I simply have gotten stuck in the syntax to perform the get on the index and how to create the tuple(s) containing the proper objects. I want to search such that searchKey1="key1" and searchKey2="key2" and ValidFrom is <= '2013-03-01' and ValidTo >= '2013-02-08'. Can anyone help me please? Many Thanks!! Jeff R. bmi=boost::multi_index bg=boost::gregorian typedef bmi::multi_index_container<TestRecord, bmi::indexed_by< bmi::ordered_non_unique< bmi::tag<idx_test >, bmi::composite_key<TestRecord, bmi::member<TestRecord, std::string, &TestRecord::searchKey1>, bmi::member<TestRecord, std::string, &TestRecord::searchKey2>, bmi::member<TestRecord, bg::date, &TestRecord::ValidFrom>, bmi::member<TestRecord, bg::date, &TestRecord::ValidTo> > > > > TestCache;

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[python] boost-python headers - are they python version specific?
by Steve Lorimer 12 Feb '13

12 Feb '13

I have python 2.7.3 and 3.2.1 deployed in my environment. I want to build 2 variants of boost python - one for each python version. My question is - will the boost headers be different; or can I just use the same header location for the boost headers, and link against a different boost-python library depending on which python version I want? TIA Steve

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unix tools
by gast128 12 Feb '13

12 Feb '13

Hello all, since Boost has marvelous cross platform libraries, wouldn't it be an idea to rewrite all the standard commandline unix tools (e.g. cp, grep, ps, ls, diff) in c++ with Boost? Libraries like program options, filesystem and regex already fullfill a lot of the functionality. Only thing left is a person with a good knowledge of the syntax of the cmd line tools and ofc a lot of time:). I mainly use Windows and i really miss these tools from time to time. And yes there is Cygwin but I would prefer just the tools without changing my environment.

6 8

[Chrono] Memory leak in Chrono?
by Don 12 Feb '13

12 Feb '13

Boost 1.53 Chrono version 2 VC 2008 Win7-64 If I #include <boost/chrono.hpp> and run my program, on program exit the VC debugger reports about 40 memory leaks. I don't have to actually use chrono, just include the header. A little trial-and-error with #include statements tracked this down to boost\chrono\io\duration_units.hpp. It looks like there are a couple of "new" allocations in the constructor for duration_units_default_initializer_t that are never deleted. As a test I added a destructor that did delete[] on them, and that fixed the memory leaks. However, there is some logic with the initialized_ variable in the constructor that leads me to suspect that this is not a viable solution for real code. :-) Can anyone suggest a better solution for this? Or failing that, give me any ideas about what this code is actually doing and/or how I might proceed? There is a good chance that someone will say "that's not a real memory leak, it's allocated once and never deleted, but it goes away when your program exits. Don't worry about it". The problem with that answer is that when you have 40 or 50 memory leaks that are "normal", everyone stops paying any attention to the memory leak report and you start adding (unintentionally) real memory leaks in your code. Thanks for your help, Don

4 4

[Preprocessor] Comma in sequence element
by Adam Badura 12 Feb '13

12 Feb '13

I have following code: #include <boost/preprocessor/seq/enum.hpp> #include <boost/preprocessor/seq/transform.hpp> template< int I, int J > struct Base { }; #define SEQ ( 1 ) ( 2 ) ( 3 ) ( 4 ) #define OP( s, data, elem ) Base< elem, elem > struct Derived : BOOST_PP_SEQ_ENUM( BOOST_PP_SEQ_TRANSFORM( OP, nil, SEQ ) ) { }; The Derived has bases classes generated from a sequence (SEQ). The bases classes themselves are instantiations of Base template type. I expected the code to be preprocessed into something like (just the important part): struct Derived : Base< 1, 1 >, Base< 2, 2 >, Base< 3, 3 >, Base< 4, 4 > { }; but instead it is preprocessed into: struct Derived : Base< 1, Base< 2, Base< 3, Base< 4 { }; This obviously is caused by Base being template with to parameters and thus having a comma. Adding parenthesis around Base in OP solves the issue by generating expected code fully. But it still does not compile because parenthesis are not allowed in that place (base classes list). Is there any other workaround? How to deal with it?

3 2

udp::socket::socket() vs udp::socket::open()
by Chris Stankevitz 11 Feb '13

11 Feb '13

Hello, The UDP async server example opens the udp socket like so: a) udp::socket::socket(io_service, udp::endpoint(udp::v4(), 13)) Boost's comment regarding this invocation: * This constructor creates a datagram socket and automatically opens it bound * to the specified endpoint on the local machine. The protocol used is the * protocol associated with the given endpoint. Please consider the udp::socket constructor that takes only an io_service: b) explicit basic_datagram_socket(boost::asio::io_service& io_service) Commented as: * This constructor creates a datagram socket without opening it. The open() * function must be called before data can be sent or received on the socket. And finally, udp::socket::open: (c) void open(const protocol_type & protocol = protocol_type()); Please note that (a) takes an endpoint while (c) takes a protocol. === Question: How can I effectively call (a) using the two-part invocation (b) then (c)? Answer: 1) Just call udp::socket::open(endpoint(udp::v4(), 13)); 2) This is impossible because (a) takes a endpoint while (c) wants a protocol 3) Why would you want to do that you moron? 4) Why don't you write your own udp::socket::open that takes an endpoint if you are so smart? Try giving back to the community instead of just taking. You are a leech and not worthy of reading this mailing list let alone posting to it. 5) none of the above Note: (1) fails with error: no matching function for call to 'boost::asio::basic_datagram_socket<boost::asio::ip::udp>::open(boost::asio::ip::udp::endpoint)' Thank you, Chris

1 0

Extracting subgrapshs
by dheeraj_kumar 11 Feb '13

11 Feb '13

Hello, It will very helpfull if anybody provide some sample code for Extracting list of subgraps's from a Graph. Regards, Dheeraj -- View this message in context: http://boost.2283326.n4.nabble.com/Extracting-subgrapshs-tp4642616.html Sent from the Boost - Users mailing list archive at Nabble.com.

2 1

modifying default compiler path
by Mahmood Naderan 11 Feb '13

11 Feb '13

Hi I have an old version of boost 1.33.1. I want to build it with a custom gcc binary whih is in a path other than default. I could not find the page on the web so I paste the first part of the gcc-tools.jam form tools/build/v1/gcc-tools.jam. # singleton variables... set-as-singleton GCC_ROOT_DIRECTORY GCC_BIN_DIRECTORY GCC_INCLUDE_DIRECTORY GCC_STDLIB_DIRECTORY ; flags gcc GCC_BIN_DIRECTORY : $(GCC_BIN_DIRECTORY) ; flags gcc GCC_INCLUDE_DIRECTORY : $(GCC_INCLUDE_DIRECTORY) ; flags gcc GCC_STDLIB_DIRECTORY : $(GCC_STDLIB_DIRECTORY) ; GCC_BIN_DIRECTORY ?= $(GCC_ROOT_DIRECTORY)$(SLASH)bin ; GCC_BIN_DIRECTORY ?= "" ; # Don't clobber tool names if GCC_ROOT_DIRECTORY not set GCC_STDLIB_DIRECTORY ?= $(GCC_ROOT_DIRECTORY)$(SLASH)lib ; # Make sure this gets set "on" the target flags gcc GCC_BIN_DIR : $(GCC_BIN_DIRECTORY) ; In this part I can modify the default gcc/g++ to my own using the variables which are defined in the comment section. However I don't know How to do that. For example, I write GCC_BIN_DIRECTORY=/opt/gcc-4.1.2/installed But that gives me this error: rule GCC_ROOT_DIRECTORY=/opt/gcc-4.1.2/installed unknown in module So how can I do that? Regards, Mahmood

1 0

[Thread] 1.53 fails to compile working code
by Szymon Gatner 10 Feb '13

10 Feb '13

Hello, following minimal code compiles fine with 1.52 and BOOST_THREAD_VERSION defined to 3 but gives compilation error with 1.53 release (Visual Studio 2008 SP1, Win 7): #include <boost/move/move.hpp> #include <boost/thread/future.hpp> class Dummy { public: Dummy& operator=(BOOST_RV_REF(Dummy) other); Dummy& operator=(BOOST_COPY_ASSIGN_REF(Dummy) other); BOOST_COPYABLE_AND_MOVABLE(Dummy); }; Dummy createDummy(); int main() { boost::future<Dummy> df = boost::async(&createDummy); } Error message: 1>------ Build started: Project: boost_153_test, Configuration: Debug Win32 ------ 1>Compiling... 1>main.cpp 1>c:\devel\boost_1_53_0\boost\thread\future.hpp(661) : error C2665: 'boost::detail::future_traits<T>::init' : none of the 2 overloads could convert all the argument types 1> with 1> [ 1> T=Dummy 1> ] 1> c:\devel\boost_1_53_0\boost\thread\future.hpp(525): could be 'void boost::detail::future_traits<T>::init(boost::scoped_ptr<T> &,Dummy &)' 1> with 1> [ 1> T=Dummy 1> ] 1> c:\devel\boost_1_53_0\boost\thread\future.hpp(530): or 'void boost::detail::future_traits<T>::init(boost::scoped_ptr<T> &,boost::rv<T> &)' 1> with 1> [ 1> T=Dummy 1> ] 1> while trying to match the argument list '(boost::scoped_ptr<T>, const Dummy)' 1> with 1> [ 1> T=Dummy 1> ] 1> c:\devel\boost_1_53_0\boost\thread\future.hpp(655) : while compiling class template member function 'void boost::detail::future_object<T>::set_value_at_thread_exit(const T &)' 1> with 1> [ 1> T=Dummy 1> ] 1> c:\devel\boost_1_53_0\boost\thread\future.hpp(1542) : see reference to class template instantiation 'boost::detail::future_object<T>' being compiled 1> with 1> [ 1> T=Dummy 1> ] 1> c:\devel\boost_1_53_0\boost\thread\future.hpp(1415) : see reference to class template instantiation 'boost::shared_future<R>' being compiled 1> with 1> [ 1> R=Dummy 1> ] 1> c:\devel\boost_1_53_0\boost\thread\future.hpp(1413) : while compiling class template member function 'boost::future<R>::future(boost::rv<T> &)' 1> with 1> [ 1> R=Dummy, 1> T=boost::future<Dummy> 1> ] 1> c:\users\bravo\documents\visual studio 2008\projects\boost_153_test\boost_153_test\main.cpp(19) : see reference to class template instantiation 'boost::future<R>' being compiled 1> with 1> [ 1> R=Dummy 1> ] 1>Build log was saved at "file://c:\Users\Bravo\Documents\Visual Studio 2008\Projects\boost_153_test\boost_153_test\Debug\BuildLog.htm" 1>boost_153_test - 1 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== Btw: why BOOST_THREAD_VERSION is still 2 when documentation says it is 4.0.0 as of boost 1.53? Regards, Szymon Gatner -- Szymon Gatner The Lordz Games Studio www.thelordzgamesstudio.com

3 14

[Interprocess] WIN32 define case unaccessible ?
by Antoine Pédron 10 Feb '13

10 Feb '13

Hello, I'm using Boost.Interprocess in order to get a single portable source code between Windows and Linux using Mutexes and Shared Memory. Documentation says that, for Windows, the API default behaviour is emulation with mapped files, which is the case (:D). Though, having a look at interprocess' headers, i encountrered this case : from D:\Libraries\boost\boost_1_51\boost\interprocess\sync\named_mutex.hpp : ____________________________________________________________________________ #if defined(BOOST_INTERPROCESS_NAMED_MUTEX_USES_POSIX_SEMAPHORES) #include <boost/interprocess/sync/posix/named_mutex.hpp> #define BOOST_INTERPROCESS_USE_POSIX_SEMAPHORES #elif !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION) && defined (BOOST_INTERPROCESS_WINDOWS) #include <boost/interprocess/sync/windows/named_mutex.hpp> #define BOOST_INTERPROCESS_USE_WINDOWS #else #include <boost/interprocess/sync/shm/named_mutex.hpp> #endif ____________________________________________________________________________ A case where BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION is not defined and BOOST_INTERPROCESS_WINDOWS is, meaning that i can use Windows standard API. My problem is that i want to use this case and i wonder how to reach it. The former file includes boost/interprocess/detail/workaround.hpp where both symbols are defined : ____________________________________________________________________________ #if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) #define BOOST_INTERPROCESS_WINDOWS #define BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION #define BOOST_INTERPROCESS_HAS_KERNEL_BOOTTIME ____________________________________________________________________________ and i can't see an #undef anywhere to get into the case i want. Thanks in advance, Antoine

2 1

Testing whether result_of<F(U)> is a valid expression
by oswin krause 08 Feb '13

08 Feb '13

Hi, Is it possible to evaluate, whether a certain argument type given to a functor will lead to a valid expression with the result_of template? i am trying to achieve the following, maybe there is a better way to do it: template<class T, class F> Container< typename boost::result_of<F(T)>::type > transform( Container<T> c, F f, std::disable_if<valid_expression<F(Block<T>) > >::type* dummy = 0 ){ //slow default implementation Container<T> res(c.size()); std::transform(c.begin(),c.end(),res.begin(),f): return res; } //blocked implmentation of transform template<class T, class F> Container< typename boost::result_of<F(T)>::type > transform( Container<T>, F functor, std::enable_if<valid_expression<F(Block<T>) > >::type* dummy = 0 ){ //functor supports fast implementation Container<T> res(c.size()); std::transform(c.blocks().begin(),c.blocks().end(),res.blocks().begin(),functor): return res; } the question is, how valid_expression<F(Block<T>) > could be implemented and right now the only mechanism which get's close to what i want would be checking result_of<F(Block<T>)> is valid. Greetings, Oswin

4 4

Re: [Boost-users] How do you compile Boost C++ code in Ubuntu?
by Giovanni 08 Feb '13

08 Feb '13

Greetings All, Thank you so much, Mr. Maddock. I was able to compile my program successfully and resolve my linking errors with your help. Also, thank you very much, Mr. Loskot! I appreciate all the precious time that you have spent to help me out. Have an awesome weekend! Regards On Fri, Feb 8, 2013 at 8:20 AM, John Maddock <boost.regex(a)virgin.net> wrote: > It is a quirk of GCC that the libraries used by a source file must appear > *after* the source file. Nothing to do with Boost really... > > John. On Fri, Feb 8, 2013 at 9:45 AM, Mateusz Loskot <mateusz(a)loskot.net> wrote: > On 8 February 2013 16:03, Giovanni <giovanni.ong(a)comsoc.org> wrote: >> I followed your instructions to link the libraries, with the >> "-lboost_filesystem -lboost_system" sequence of linking the >> aforementioned Boost C++ libraries. >> >> However, I cannot resolve the linking error. I have included a >> snippet from my Terminal session below. > > No idea what's wrong really and have no time to investigate it. > But, I've done quick test on Ubuntu 10.04 using Boost 1.40 > installed from its packages and small sample from this book > http://en.highscore.de/cpp/boost/errorhandling.html > and it worked for me: > > Here is my console log: > > mloskot@vb-ubuntu104-x64:~/tmp$ /usr/bin/lsb_release -d > Description: Ubuntu 10.04.4 LTS > > mloskot@vb-ubuntu104-x64:~/tmp$ cat bsystem.cpp > #include <boost/system/error_code.hpp> > #include <iostream> > #include <string> > > class application_category : > public boost::system::error_category > { > public: > const char *name() const { return "application"; } > std::string message(int ev) const { return "error message"; } > }; > > application_category cat; > > int main() > { > boost::system::error_code ec(14, cat); > std::cout << ec.value() << std::endl; > std::cout << ec.category().name() << std::endl; > } > > mloskot@vb-ubuntu104-x64:~/tmp$ g++ -L/usr/lib -lboost_system bsystem.cpp > mloskot@vb-ubuntu104-x64:~/tmp$ ./a.out > 14 > application > > mloskot@vb-ubuntu104-x64:~/tmp$ ldd ./a.out |grep boost > libboost_system.so.1.40.0 => /usr/lib/libboost_system.so.1.40.0 > (0x00007f2df87b6000) > > > Perhaps something has changed in later versions. > I have no time to dig it deeper, sorry. > > Best regards,

1 0

Re: [Boost-users] How do you compile Boost C++ code in Ubuntu?
by Giovanni 08 Feb '13

08 Feb '13

Greetings, I realized that when I installed certain packages from the Ubuntu Software Center, I had broken some dependencies. That may have caused the problem. Now, I have reinstalled Boost C++. See the following for a snippet from the Terminal session that indicates the availability of the previously missing files. Go Bears >ls -al | grep libboost_system -rw-r--r-- 1 root root 48666 Jan 2 2012 libboost_system.a lrwxrwxrwx 1 root root 17 Jan 2 2012 libboost_system-mt.a -> libboost_system.a lrwxrwxrwx 1 root root 25 Jan 2 2012 libboost_system-mt.so -> libboost_system.so.1.46.1 lrwxrwxrwx 1 root root 25 Jan 2 2012 libboost_system.so -> libboost_system.so.1.46.1 -rw-r--r-- 1 root root 14568 Jan 2 2012 libboost_system.so.1.46.1 Go Bears > Go Bears >make all g++ -L/usr/lib -lboost_system get_sys_info.cpp /tmp/cckONUUl.o: In function `__static_initialization_and_destruction_0(int, int)': get_sys_info.cpp:(.text+0x13f): undefined reference to `boost::system::generic_category()' get_sys_info.cpp:(.text+0x14b): undefined reference to `boost::system::generic_category()' get_sys_info.cpp:(.text+0x157): undefined reference to `boost::system::system_category()' /tmp/cckONUUl.o: In function `boost::filesystem3::path::codecvt()': get_sys_info.cpp:(.text._ZN5boost11filesystem34path7codecvtEv[boost::filesystem3::path::codecvt()]+0x5): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()' collect2: ld returned 1 exit status make: *** [all] Error 1 Go Bears > So, I am back to square one with the "undefined reference" compilation error. Can you please kindly suggest how can I resolve this problem? Thank you. Regards On Thu, Feb 7, 2013 at 8:33 AM, Mateusz Loskot <mateusz(a)loskot.net> wrote: > On 7 February 2013 15:21, Giovanni <giovanni.ong(a)comsoc.org> wrote: >> >> I had set the shell variable $LD_LIBRARY_PATH to: >> /usr/lib/libboost_system.so. It was originally empty. I used the >> "echo" command to reflect the path that I had set it to. > > I tried to make a point not about how you did set the variable, > but about the fact it has incorrect value. > Let me copy it once again: > > "LD_LIBRARY_PATH, which is a colon-separated list of directories" [1] > > [1] http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html > > And you may learn from that what the LD_LIBRARY_PATH is meant to be. > >> I had installed it with Ubuntu Software Center. >> Here is a snippet of: /usr/lib >> [...] >> -rw-r--r-- 1 root root 14568 Jan 2 2012 libboost_system.so.1.46.1 >> -rw-r--r-- 1 root root 14568 Jan 5 2012 libboost_system.so.1.48.0 > > You seem to be missing libboost_system.so library or symlink named > libboost_system.so with one of the two as a target. > It may look the installation is broken. > >> When I followed your instructions to install it (again), I couldn't. >> Here is the transcript from the Terminal. >> Go Bears >sudo apt-get install libboost-system-dev >> [sudo] password for arvind: >> Reading package lists... Done >> Building dependency tree >> Reading state information... Done >> Some packages could not be installed. This may mean that you have >> requested an impossible situation or if you are using the unstable >> distribution that some required packages have not yet been created >> or been moved out of Incoming. >> The following information may help to resolve the situation: >> >> The following packages have unmet dependencies: >> libboost-system-dev : Depends: libboost-system1.46-dev but it is not >> going to be installed >> E: Unable to correct problems, you have held broken packages. > > Clearly, something is broken with installation of boost packages in your system. > You should seek for help from Ubuntu folks, it's unrelated to Boost. >

3 4

[python] how to call python's built-in type() function
by Eric Niebler 08 Feb '13

08 Feb '13

In C++, I have a boost::python::object that is wrapping ... something. I'd like to find out what. If I were in python land, I'd call the built-in 'type' function on it. What do I do in C++? Thanks in advance, -- Eric Niebler Boost.org

2 1

Problem with boost 1.53 compilation in Windows
by DUNDEK Ivan 08 Feb '13

08 Feb '13

Hi. We are using boost in our project, and now with 1.53 and some added options we are unable to compile the boost in Windows. In Linux, the build is OK. It seems, that when compiling under Windows, the path for compiled boost obj files depends on the options specified, so if there are many options specified, the path become too long. With reduced number of options, the build is OK. Build environment: Windows7 64bit, Boost 1.53, VisualStudio 2010 Express Here is the build command: bjam -d2 --toolset=msvc-10.0 variant=debug,release threading=multi link=static runtime-link=shared install boost.locale.std=on boost.locale.icu=off boost.locale.winapi=off boost.locale.posix=off -a --with-log --with-thread --with-system --with-date_time --with-filesystem --with-program_options --with-iostreams --with-regex --with-serialization --with-locale --with-atomic define=BOOST_LOG_NO_SETTINGS_PARSERS_SUPPORT --prefix="c:\projects\cpce-cpp-stack\1.3.0\win" -sZLIB_SOURCE="c:\projects\cpce-cpp-stack\1.3.0\win\third-party\zlib-1.2.7" And the output: Performing configuration checks - iconv (libc) : no - iconv (separate) : no - has_icu builds : no Component configuration: - atomic : building - chrono : not building - context : not building - date_time : building - exception : not building - filesystem : building - graph : not building - graph_parallel : not building - iostreams : building - locale : building - log : building - math : not building - mpi : not building - program_options : building - python : not building - random : not building - regex : building - serialization : building - signals : not building - system : building - test : not building - thread : building - timer : not building - wave : not building ...patience... ...patience... ...patience... ...patience... ...found 30159 targets... ...updating 10944 targets... …. file bin.v2\libs\program_options\build\msvc-10.0\debug\boost.locale.icu-off\boost.locale.posix-off\boost.locale.std-on\boost.locale.winapi-off\link-static\threading-multi\split.obj.rsp "libs\program_options\src\split.cpp" -Fo"bin.v2\libs\program_options\build\msvc-10.0\debug\boost.locale.icu-off\boost.locale.posix-off\boost.locale.std-on\boost.locale.winapi-off\link-static\threading-multi\split.obj" -TP /Z7 /Od /Ob0 /W3 /GR /MDd /Zc:forScope /Zc:wchar_t /wd4675 /EHs -c -DBOOST_ALL_NO_LIB=1 -DBOOST_LOG_NO_SETTINGS_PARSERS_SUPPORT "-I." compile-c-c++ bin.v2\libs\program_options\build\msvc-10.0\debug\boost.locale.icu-off\boost.locale.posix-off\boost.locale.std-on\boost.locale.winapi-off\link-static\threading-multi\split.obj call "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\vcvarsall.bat" x86 >nul cl /Zm800 -nologo @"bin.v2\libs\program_options\build\msvc-10.0\debug\boost.locale.icu-off\boost.locale.posix-off\boost.locale.std-on\boost.locale.winapi-off\link-static\threading-multi\split.obj.rsp" split.cpp failed to write output file 'bin.v2\libs\program_options\build\msvc-10.0\debug\boost.locale.icu-off\boost.locale.posix-off\boost.locale.std-on\boost.locale.winapi-off\link-static\threading-multi\libboost_program_options-vc100-mt-gd-1_53.lib.rsp'! c:\projects\cpce-cpp-stack\1.3.0\src\boost_1_53_0>cd "c:\projects\cpce-cpp-stack\1.3.0\win" Thank you for advice Best regards Ivan Dundek.

2 2

Problem linking with boost 1, 51 64-bits from boostpro, VC10
by Alain Leblanc 07 Feb '13

07 Feb '13

Hi, I'm having some issues linking my code with the 64-bit version of boost 1.51 on windows with VC 10. I managed to write this small example that illustrates my problem. It is a project to create a DLL. I downloaded from boostpro.com. Here's the code: #include <boost/regex.hpp> #include <boost/filesystem.hpp> void useBoost() { } and the result. ------ Build started: Project: test-64, Configuration: Release x64 ------ UsesRegex.cpp UsesRegex.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system@boost@ @YAAEBVerror_category@12@XZ) UsesRegex.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::generic_category(void)" (?generic_category@system@boost@ @YAAEBVerror_category@12@XZ) C:\Users\aleblanc\projects\trunk\XDE\sandbox\alain\c-testing\test-64\x64\Release\test-64.dll : fatal error LNK1120: 2 unresolved externals ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== However, if I comment out the include for filesystem.hpp it compiles ok. I have included the path to the boost libraries in the 'Additional Library Directories' property for the linker. otherwise it complains about not finding the library for boost_regex. Compiling for 32 bit (with the path for the libraries to a 32-bit installation of boost) works fine. Any suggestion would be appreciated. Thanks, a

3 3

boost compiler warnings
by Dave Dyer 07 Feb '13

07 Feb '13

Using boost 52 on OSX / 64 and xcode 4, the new mac compiler produces a lot of "semantic issue" warnings. I assume these are all not consequential, but is this lint being addressed? The two issues it is complaining about is that "long" is compiled as int64, and that using string literals as char * is deprecated.

2 1

Serialization: BOOST_CLASS_EXPORT changes between 1.38 and 1.52
by Nathan Whitehorn 07 Feb '13

07 Feb '13

I'm upgrading a large data analysis project from boost 1.38 to 1.52 (see this 2008 Boostcon talk for details: http://www.icecube.umd.edu/~troy/talks/icefishing.pdf) Everything has gone remarkably smoothly, with a minimal degree of #if, except for one thing: a change in the semantics of BOOST_CLASS_EXPORT. The software is organized into a number of shared libraries each of which have serializable classes that generally inherit from a shared base class, through pointers to which the derived classes are almost always [de]serialized to/from a custom archive type. When using 1.38, the BOOST_CLASS_EXPORT directive was kept in the implementation file for each serializable class. This almost still works for 1.52 but can result in strange behavior that took me two days to track down. Some of our classes would report through unregistered class errors on [de]serialization. Which ones would depend on circumstances, compiler version, linker, and operating system. The reason turns out to be changes in handling of the class GUID. This is associated to the pointer serializer by BOOST_CLASS_EXPORT -- but also now apparently by the first instantiated code [de]serializing the class through that archive directly based on the presence of a template specialization of boost::serialization::guid<T>() currently in scope, which is NULL by default. Once NULL is set as the GUID, it stays that way, regardless of a proper BOOST_CLASS_EXPORT later. This occurred in our case as a result of def_pickle() calls in boost.python bindings that used the same classes and archive type. This can be fixed by BOOST_CLASS_EXPORT_KEY in all appropriate header files. Adding it is a sizeable amount of work (hundreds of classes) but I'm more concerned the mechanism is very fragile in the case of templates and I'm not sure what to do there. For example, we have a generic serializable container. Any specialization of it needs to be registered with BOOST_CLASS_EXPORT, which is fine, but anyone using that specialization needs to also include a header file BOOST_CLASS_EXPORT_KEY() in it for that particular specialization as well. In other words, you can't just use container<Foo> and expect it to work reliably and, moreover, if you use it *once* without having seen the right in-scope macro, it will break serialization of that type globally if you happen to have linked against a library that made this mistake. Probably. Depending on initialization order. So my questions: 1. Is it possible for things that would return GUIDs of NULL to try harder and look in a global registry instead of silently breaking things? This kind of global lookup was how 1.38 always worked and it seems considerably less fragile. 2. Is there a way to handle BOOST_CLASS_EXPORT_KEY() sanely in the case of templates without the risk of silent serialization failures -- in all instances of that class -- that depend on global initialization order? 3. Is it possible to change the GUID set in the extended type info object of a pointer_[i/o]serializer at runtime after the class has been added to the export registry? 4. Are there any suggested mechanisms for local hacks, given that we control the archive implementation, to implement 1-3 without changes to boost? -Nathan

2 3

[serialization] Support for Boost.Container?
by Jensen, Erik A 07 Feb '13

07 Feb '13

I see that Boost.Serialization has support for serializing STL containers, such as std::vector. However, I can't seem to serialize a boost::container::vector. Do I need to do something special to get this to work, or is it not supported? I need guaranteed support for incomplete types, so I can't use an STL vector. If it is not supported, what is my best bet, for now? Are there any plans to do so? Using Boost.Serialization with Boost.Container is something I would expect to just work, and it seems like most of the STL code could be reused. Thanks.

6 7

Re: [Boost-users] enable_shared_from_this()
by John M. Dlugosz 07 Feb '13

07 Feb '13

Frank Mori Hess<fmh6jj(a)gmail.com> wrote: > That means > throwing exceptions from the constructor after using shared_from_raw > (or in any derived constructor since ithe derived constructor would be > called later) causes bad things to happen. That's no different from stashing away a raw pointer from a constructor (e.g. passing it as a "parent" pointer to a referenced object). But that could be improved upon: The collaborators can be given a weak_ptr only. But, we may require that collaborators have owning references. In my library, a "borrower" (weak_ptr) could optionally hold a strong reference as well, so the reference could be upgraded from weak to strong after a point of commitment is reached. If there were some kind of on-spec pending ptr type, they could be seen as strong references eventually and in normal use, but automatically cleared or committed by the Create wrapper. That is, you would not have to keep track of the collaborators and hook them up in a second stage; rather, all such pending ptrs would become solid (wherever they are) with one call made after the ctor is golden. I never had a problem with it, though. —John

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Re: [Boost-users] How do you compile Boost C++ code in Ubuntu?
by Giovanni 07 Feb '13

07 Feb '13

Greetings, I am sorry for the confusion; I mean my code that uses Boost C++ Libraries. I had set the shell variable $LD_LIBRARY_PATH to: /usr/lib/libboost_system.so. It was originally empty. I used the "echo" command to reflect the path that I had set it to. I had installed it with Ubuntu Software Center. Here is a snippet of: /usr/lib -rw-r--r-- 1 root root 31152 Jan 5 2012 libboost_chrono.so.1.48.0 -rw-r--r-- 1 root root 68216 Jan 2 2012 libboost_date_time.so.1.46.1 -rw-r--r-- 1 root root 122280 Jan 2 2012 libboost_filesystem.so.1.46.1 -rw-r--r-- 1 root root 324192 Jan 2 2012 libboost_graph.so.1.46.1 -rw-r--r-- 1 root root 328328 Jan 5 2012 libboost_graph.so.1.48.0 -rw-r--r-- 1 root root 101592 Jan 2 2012 libboost_iostreams.so.1.46.1 -rw-r--r-- 1 root root 885000 Jan 5 2012 libboost_locale.so.1.48.0 -rw-r--r-- 1 root root 105264 Jan 2 2012 libboost_math_c99f.so.1.46.1 -rw-r--r-- 1 root root 109264 Jan 2 2012 libboost_math_c99l.so.1.46.1 -rw-r--r-- 1 root root 109312 Jan 2 2012 libboost_math_c99.so.1.46.1 -rw-r--r-- 1 root root 265088 Jan 2 2012 libboost_math_tr1f.so.1.46.1 -rw-r--r-- 1 root root 244536 Jan 2 2012 libboost_math_tr1l.so.1.46.1 -rw-r--r-- 1 root root 240440 Jan 2 2012 libboost_math_tr1.so.1.46.1 -rw-r--r-- 1 root root 89656 Jan 3 2012 libboost_mpi_python-py27.so.1.46.1 -rw-r--r-- 1 root root 89656 Jan 3 2012 libboost_mpi_python-py32.so.1.46.1 -rw-r--r-- 1 root root 180320 Jan 3 2012 libboost_mpi.so.1.46.1 -rw-r--r-- 1 root root 180320 Jan 5 2012 libboost_mpi.so.1.48.0 -rw-r--r-- 1 root root 116720 Jan 5 2012 libboost_prg_exec_monitor.a lrwxrwxrwx 1 root root 27 Jan 5 2012 libboost_prg_exec_monitor-mt.a -> libboost_prg_exec_monitor.a lrwxrwxrwx 1 root root 35 Jan 5 2012 libboost_prg_exec_monitor-mt.so -> libboost_prg_exec_monitor.so.1.48.0 lrwxrwxrwx 1 root root 35 Jan 5 2012 libboost_prg_exec_monitor.so -> libboost_prg_exec_monitor.so.1.48.0 -rw-r--r-- 1 root root 56352 Jan 2 2012 libboost_prg_exec_monitor.so.1.46.1 -rw-r--r-- 1 root root 56352 Jan 5 2012 libboost_prg_exec_monitor.so.1.48.0 -rw-r--r-- 1 root root 414280 Jan 2 2012 libboost_program_options.so.1.46.1 -rw-r--r-- 1 root root 311168 Jan 2 2012 libboost_python-py27.so.1.46.1 -rw-r--r-- 1 root root 315264 Jan 5 2012 libboost_python-py27.so.1.48.0 -rw-r--r-- 1 root root 307072 Jan 2 2012 libboost_python-py32.so.1.46.1 -rw-r--r-- 1 root root 311136 Jan 5 2012 libboost_python-py32.so.1.48.0 -rw-r--r-- 1 root root 10472 Jan 2 2012 libboost_random.so.1.46.1 -rw-r--r-- 1 root root 1054456 Jan 2 2012 libboost_regex.so.1.46.1 -rw-r--r-- 1 root root 1079096 Jan 5 2012 libboost_regex.so.1.48.0 -rw-r--r-- 1 root root 1240020 Jan 5 2012 libboost_serialization.a lrwxrwxrwx 1 root root 24 Jan 5 2012 libboost_serialization-mt.a -> libboost_serialization.a lrwxrwxrwx 1 root root 32 Jan 5 2012 libboost_serialization-mt.so -> libboost_serialization.so.1.48.0 lrwxrwxrwx 1 root root 32 Jan 5 2012 libboost_serialization.so -> libboost_serialization.so.1.48.0 -rw-r--r-- 1 root root 446584 Jan 2 2012 libboost_serialization.so.1.46.1 -rw-r--r-- 1 root root 446584 Jan 5 2012 libboost_serialization.so.1.48.0 -rw-r--r-- 1 root root 80600 Jan 2 2012 libboost_signals.so.1.46.1 -rw-r--r-- 1 root root 14568 Jan 2 2012 libboost_system.so.1.46.1 -rw-r--r-- 1 root root 14568 Jan 5 2012 libboost_system.so.1.48.0 -rw-r--r-- 1 root root 1635110 Jan 5 2012 libboost_test_exec_monitor.a lrwxrwxrwx 1 root root 28 Jan 5 2012 libboost_test_exec_monitor-mt.a -> libboost_test_exec_monitor.a -rw-r--r-- 1 root root 101304 Jan 2 2012 libboost_thread.so.1.46.1 -rw-r--r-- 1 root root 109536 Jan 5 2012 libboost_thread.so.1.48.0 -rw-r--r-- 1 root root 33102 Jan 5 2012 libboost_timer.a lrwxrwxrwx 1 root root 16 Jan 5 2012 libboost_timer-mt.a -> libboost_timer.a lrwxrwxrwx 1 root root 24 Jan 5 2012 libboost_timer-mt.so -> libboost_timer.so.1.48.0 lrwxrwxrwx 1 root root 24 Jan 5 2012 libboost_timer.so -> libboost_timer.so.1.48.0 -rw-r--r-- 1 root root 18832 Jan 5 2012 libboost_timer.so.1.48.0 -rw-r--r-- 1 root root 1879526 Jan 5 2012 libboost_unit_test_framework.a lrwxrwxrwx 1 root root 30 Jan 5 2012 libboost_unit_test_framework-mt.a -> libboost_unit_test_framework.a lrwxrwxrwx 1 root root 38 Jan 5 2012 libboost_unit_test_framework-mt.so -> libboost_unit_test_framework.so.1.48.0 lrwxrwxrwx 1 root root 38 Jan 5 2012 libboost_unit_test_framework.so -> libboost_unit_test_framework.so.1.48.0 -rw-r--r-- 1 root root 656824 Jan 2 2012 libboost_unit_test_framework.so.1.46.1 -rw-r--r-- 1 root root 669080 Jan 5 2012 libboost_unit_test_framework.so.1.48.0 -rw-r--r-- 1 root root 1320168 Jan 2 2012 libboost_wave.so.1.46.1 -rw-r--r-- 1 root root 845962 Jan 5 2012 libboost_wserialization.a lrwxrwxrwx 1 root root 25 Jan 5 2012 libboost_wserialization-mt.a -> libboost_wserialization.a lrwxrwxrwx 1 root root 33 Jan 5 2012 libboost_wserialization-mt.so -> libboost_wserialization.so.1.48.0 lrwxrwxrwx 1 root root 33 Jan 5 2012 libboost_wserialization.so -> libboost_wserialization.so.1.48.0 -rw-r--r-- 1 root root 323128 Jan 2 2012 libboost_wserialization.so.1.46.1 -rw-r--r-- 1 root root 323128 Jan 5 2012 libboost_wserialization.so.1.48.0 Here is a listing of the files in: /usr/include/boost Go Bears >ls -al total 1308 drwxr-xr-x 86 root root 12288 Feb 7 03:51 . drwxr-xr-x 121 root root 20480 Feb 7 03:50 .. drwxr-xr-x 5 root root 4096 Feb 7 03:50 accumulators drwxr-xr-x 3 root root 4096 Feb 7 03:50 algorithm -rw-r--r-- 1 root root 4297 Jan 5 2012 aligned_storage.hpp -rw-r--r-- 1 root root 6505 Jan 5 2012 any.hpp drwxr-xr-x 5 root root 4096 Feb 7 03:51 archive -rw-r--r-- 1 root root 15525 Jan 5 2012 array.hpp drwxr-xr-x 9 root root 4096 Feb 7 03:50 asio -rw-r--r-- 1 root root 4265 Jan 5 2012 asio.hpp -rw-r--r-- 1 root root 4120 Jan 5 2012 assert.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 assign -rw-r--r-- 1 root root 614 Jan 5 2012 assign.hpp drwxr-xr-x 9 root root 4096 Feb 7 03:51 bimap -rw-r--r-- 1 root root 387 Jan 5 2012 bimap.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:50 bind -rw-r--r-- 1 root root 581 Jan 5 2012 bind.hpp -rw-r--r-- 1 root root 618 Jan 5 2012 blank_fwd.hpp -rw-r--r-- 1 root root 1946 Jan 5 2012 blank.hpp -rw-r--r-- 1 root root 773 Jan 5 2012 call_traits.hpp -rw-r--r-- 1 root root 4455 Jan 5 2012 cast.hpp -rw-r--r-- 1 root root 4173 Jan 5 2012 cerrno.hpp -rw-r--r-- 1 root root 1589 Jan 5 2012 checked_delete.hpp drwxr-xr-x 4 root root 4096 Feb 7 03:50 chrono -rw-r--r-- 1 root root 706 Jan 5 2012 chrono.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:50 circular_buffer -rw-r--r-- 1 root root 1157 Jan 5 2012 circular_buffer_fwd.hpp -rw-r--r-- 1 root root 2540 Jan 5 2012 circular_buffer.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 compatibility -rw-r--r-- 1 root root 801 Jan 5 2012 compressed_pair.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 concept -rw-r--r-- 1 root root 23671 Jan 5 2012 concept_archetype.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:50 concept_check -rw-r--r-- 1 root root 32100 Jan 5 2012 concept_check.hpp drwxr-xr-x 7 root root 4096 Feb 7 03:51 config -rw-r--r-- 1 root root 2074 Jan 5 2012 config.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 container -rw-r--r-- 1 root root 33373 Jan 5 2012 crc.hpp -rw-r--r-- 1 root root 721 Jan 5 2012 cregex.hpp -rw-r--r-- 1 root root 17287 Jan 5 2012 cstdint.hpp -rw-r--r-- 1 root root 1739 Jan 5 2012 cstdlib.hpp -rw-r--r-- 1 root root 1511 Jan 5 2012 current_function.hpp drwxr-xr-x 5 root root 4096 Feb 7 03:50 date_time -rw-r--r-- 1 root root 587 Jan 5 2012 date_time.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 detail drwxr-xr-x 2 root root 4096 Feb 7 03:50 dynamic_bitset -rw-r--r-- 1 root root 675 Jan 5 2012 dynamic_bitset_fwd.hpp -rw-r--r-- 1 root root 560 Jan 5 2012 dynamic_bitset.hpp -rw-r--r-- 1 root root 530 Jan 5 2012 enable_shared_from_this.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 exception -rw-r--r-- 1 root root 434 Jan 5 2012 exception.hpp -rw-r--r-- 1 root root 374 Jan 5 2012 exception_ptr.hpp drwxr-xr-x 5 root root 4096 Feb 7 03:50 filesystem -rw-r--r-- 1 root root 1340 Jan 5 2012 filesystem.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 flyweight -rw-r--r-- 1 root root 622 Jan 5 2012 flyweight.hpp -rw-r--r-- 1 root root 2198 Jan 5 2012 foreach_fwd.hpp -rw-r--r-- 1 root root 45365 Jan 5 2012 foreach.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 format -rw-r--r-- 1 root root 2179 Jan 5 2012 format.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 function drwxr-xr-x 4 root root 4096 Feb 7 03:50 functional -rw-r--r-- 1 root root 18893 Jan 5 2012 functional.hpp -rw-r--r-- 1 root root 791 Jan 5 2012 function_equal.hpp -rw-r--r-- 1 root root 2200 Jan 5 2012 function.hpp -rw-r--r-- 1 root root 1574 Jan 5 2012 function_output_iterator.hpp drwxr-xr-x 4 root root 4096 Feb 7 03:51 function_types drwxr-xr-x 13 root root 4096 Feb 7 03:51 fusion -rw-r--r-- 1 root root 1859 Jan 5 2012 generator_iterator.hpp drwxr-xr-x 13 root root 4096 Feb 7 03:50 geometry -rw-r--r-- 1 root root 704 Jan 5 2012 geometry.hpp -rw-r--r-- 1 root root 921 Jan 5 2012 get_pointer.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 gil drwxr-xr-x 7 root root 12288 Feb 7 03:50 graph drwxr-xr-x 6 root root 4096 Feb 7 03:50 icl -rw-r--r-- 1 root root 794 Jan 5 2012 implicit_cast.hpp -rw-r--r-- 1 root root 1039 Jan 5 2012 indirect_reference.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:51 integer -rw-r--r-- 1 root root 4617 Jan 5 2012 integer_fwd.hpp -rw-r--r-- 1 root root 10877 Jan 5 2012 integer.hpp -rw-r--r-- 1 root root 8714 Jan 5 2012 integer_traits.hpp drwxr-xr-x 11 root root 4096 Feb 7 03:51 interprocess drwxr-xr-x 3 root root 4096 Feb 7 03:50 intrusive -rw-r--r-- 1 root root 499 Jan 5 2012 intrusive_ptr.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 io -rw-r--r-- 1 root root 2381 Jan 5 2012 io_fwd.hpp drwxr-xr-x 5 root root 4096 Feb 7 03:51 iostreams -rw-r--r-- 1 root root 634 Jan 5 2012 is_placeholder.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 iterator -rw-r--r-- 1 root root 466 Jan 5 2012 iterator_adaptors.hpp -rw-r--r-- 1 root root 1983 Jan 5 2012 iterator.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 lambda -rw-r--r-- 1 root root 1271 Jan 5 2012 last_value.hpp -rw-r--r-- 1 root root 75248 Jan 5 2012 lexical_cast.hpp -rw-r--r-- 1 root root 6119 Jan 5 2012 limits.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 locale -rw-r--r-- 1 root root 887 Jan 5 2012 locale.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:51 logic -rw-r--r-- 1 root root 484 Jan 5 2012 make_shared.hpp drwxr-xr-x 10 root root 4096 Feb 7 03:50 math -rw-r--r-- 1 root root 2527 Jan 5 2012 math_fwd.hpp -rw-r--r-- 1 root root 596 Jan 5 2012 mem_fn.hpp -rw-r--r-- 1 root root 1273 Jan 5 2012 memory_order.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:50 move drwxr-xr-x 5 root root 4096 Feb 7 03:50 mpi -rw-r--r-- 1 root root 1101 Jan 5 2012 mpi.hpp drwxr-xr-x 10 root root 12288 Feb 7 03:50 mpl drwxr-xr-x 5 root root 4096 Feb 7 03:50 msm drwxr-xr-x 2 root root 4096 Feb 7 03:50 multi_array -rw-r--r-- 1 root root 15351 Jan 5 2012 multi_array.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 multi_index -rw-r--r-- 1 root root 3794 Jan 5 2012 multi_index_container_fwd.hpp -rw-r--r-- 1 root root 33455 Jan 5 2012 multi_index_container.hpp -rw-r--r-- 1 root root 1296 Jan 5 2012 next_prior.hpp -rw-r--r-- 1 root root 1014 Jan 5 2012 noncopyable.hpp -rw-r--r-- 1 root root 595 Jan 5 2012 nondet_random.hpp -rw-r--r-- 1 root root 773 Jan 5 2012 none.hpp -rw-r--r-- 1 root root 605 Jan 5 2012 none_t.hpp -rw-r--r-- 1 root root 619 Jan 5 2012 non_type.hpp drwxr-xr-x 5 root root 4096 Feb 7 03:50 numeric -rw-r--r-- 1 root root 38818 Jan 5 2012 operators.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:50 optional -rw-r--r-- 1 root root 528 Jan 5 2012 optional.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 parameter -rw-r--r-- 1 root root 724 Jan 5 2012 parameter.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 pending drwxr-xr-x 12 root root 4096 Feb 7 03:51 phoenix -rw-r--r-- 1 root root 476 Jan 5 2012 phoenix.hpp -rw-r--r-- 1 root root 1821 Jan 5 2012 pointee.hpp -rw-r--r-- 1 root root 1124 Jan 5 2012 pointer_cast.hpp -rw-r--r-- 1 root root 1199 Jan 5 2012 pointer_to_other.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 polygon drwxr-xr-x 3 root root 4096 Feb 7 03:50 pool drwxr-xr-x 19 root root 4096 Feb 7 03:50 preprocessor -rw-r--r-- 1 root root 486 Jan 5 2012 preprocessor.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 program_options -rw-r--r-- 1 root root 819 Jan 5 2012 program_options.hpp -rw-r--r-- 1 root root 5510 Jan 5 2012 progress.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 property_map drwxr-xr-x 3 root root 4096 Feb 7 03:51 property_tree drwxr-xr-x 6 root root 4096 Feb 7 03:50 proto drwxr-xr-x 3 root root 4096 Feb 7 03:50 ptr_container drwxr-xr-x 6 root root 4096 Feb 7 03:51 python -rw-r--r-- 1 root root 2868 Jan 5 2012 python.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 random -rw-r--r-- 1 root root 3644 Jan 5 2012 random.hpp drwxr-xr-x 6 root root 4096 Feb 7 03:50 range -rw-r--r-- 1 root root 842 Jan 5 2012 range.hpp drwxr-xr-x 4 root root 4096 Feb 7 03:51 ratio -rw-r--r-- 1 root root 349 Jan 5 2012 ratio.hpp -rw-r--r-- 1 root root 19603 Jan 5 2012 rational.hpp -rw-r--r-- 1 root root 3926 Jan 5 2012 ref.hpp drwxr-xr-x 5 root root 4096 Feb 7 03:50 regex -rw-r--r-- 1 root root 693 Jan 5 2012 regex_fwd.hpp -rw-r--r-- 1 root root 2174 Jan 5 2012 regex.h -rw-r--r-- 1 root root 823 Jan 5 2012 regex.hpp -rw-r--r-- 1 root root 502 Jan 5 2012 scoped_array.hpp -rw-r--r-- 1 root root 491 Jan 5 2012 scoped_ptr.hpp -rw-r--r-- 1 root root 9936 Jan 5 2012 scope_exit.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 serialization -rw-r--r-- 1 root root 552 Jan 5 2012 shared_array.hpp -rw-r--r-- 1 root root 2007 Jan 5 2012 shared_container_iterator.hpp -rw-r--r-- 1 root root 539 Jan 5 2012 shared_ptr.hpp -rw-r--r-- 1 root root 12795 Jan 5 2012 signal.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 signals drwxr-xr-x 3 root root 4096 Feb 7 03:50 signals2 -rw-r--r-- 1 root root 752 Jan 5 2012 signals2.hpp -rw-r--r-- 1 root root 345 Jan 5 2012 signals.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 smart_ptr -rw-r--r-- 1 root root 892 Jan 5 2012 smart_ptr.hpp drwxr-xr-x 17 root root 4096 Feb 7 03:50 spirit -rw-r--r-- 1 root root 1085 Jan 5 2012 spirit.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:50 statechart -rw-r--r-- 1 root root 5244 Jan 5 2012 static_assert.hpp -rw-r--r-- 1 root root 3391 Jan 5 2012 strong_typedef.hpp -rw-r--r-- 1 root root 287 Jan 5 2012 swap.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:51 system drwxr-xr-x 7 root root 4096 Feb 7 03:51 test drwxr-xr-x 5 root root 4096 Feb 7 03:51 thread -rw-r--r-- 1 root root 839 Jan 5 2012 thread.hpp -rw-r--r-- 1 root root 2652 Jan 5 2012 throw_exception.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:50 timer -rw-r--r-- 1 root root 2663 Jan 5 2012 timer.hpp -rw-r--r-- 1 root root 19728 Jan 5 2012 token_functions.hpp -rw-r--r-- 1 root root 3742 Jan 5 2012 token_iterator.hpp -rw-r--r-- 1 root root 2783 Jan 5 2012 tokenizer.hpp drwxr-xr-x 4 root root 4096 Feb 7 03:50 tr1 drwxr-xr-x 3 root root 4096 Feb 7 03:51 tuple -rw-r--r-- 1 root root 481 Jan 5 2012 type.hpp drwxr-xr-x 5 root root 4096 Feb 7 03:51 typeof drwxr-xr-x 4 root root 12288 Feb 7 03:51 type_traits -rw-r--r-- 1 root root 4264 Jan 5 2012 type_traits.hpp drwxr-xr-x 6 root root 4096 Feb 7 03:51 units drwxr-xr-x 3 root root 4096 Feb 7 03:50 unordered -rw-r--r-- 1 root root 550 Jan 5 2012 unordered_map.hpp -rw-r--r-- 1 root root 550 Jan 5 2012 unordered_set.hpp drwxr-xr-x 3 root root 4096 Feb 7 03:51 utility -rw-r--r-- 1 root root 739 Jan 5 2012 utility.hpp drwxr-xr-x 2 root root 4096 Feb 7 03:50 uuid drwxr-xr-x 3 root root 4096 Feb 7 03:50 variant -rw-r--r-- 1 root root 883 Jan 5 2012 variant.hpp -rw-r--r-- 1 root root 1124 Jan 5 2012 version.hpp -rw-r--r-- 1 root root 719 Jan 5 2012 visit_each.hpp drwxr-xr-x 5 root root 4096 Feb 7 03:50 wave -rw-r--r-- 1 root root 926 Jan 5 2012 wave.hpp -rw-r--r-- 1 root root 474 Jan 5 2012 weak_ptr.hpp drwxr-xr-x 4 root root 4096 Feb 7 03:50 xpressive Go Bears >pwd /usr/include/boost I may be terribly wrong, but I believe that I have already installed Boost C++ Libraries. When I followed your instructions to install it (again), I couldn't. Here is the transcript from the Terminal. Go Bears >sudo apt-get install libboost-system-dev [sudo] password for arvind: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libboost-system-dev : Depends: libboost-system1.46-dev but it is not going to be installed E: Unable to correct problems, you have held broken packages. Go Bears > Can you please kindly tell me where did I go wrong, and what is wrong? Can you also please kindly tell me how can I compile my C++ code that uses Boost C++ Libraries? Thank you very much, and have an awesome day! Regards On Thu, Feb 7, 2013 at 6:18 AM, Mateusz Loskot <mateusz(a)loskot.net> wrote: > On 7 February 2013 10:06, Giovanni <giovanni.ong(a)comsoc.org> wrote: >> Greetings, >> I cannot compile my Boost C++ code. > > Do you mean Boost C++ code, thus building Boost libraries, > or you mean your code that *uses* Boost libraries? Unclear. > >> Initially, it complains of “undefined reference”. When I try to >> resolve this by including the library, I get the "/usr/bin/ld: cannot >> find -lboost_system" error. > > So, looks like the former, you are trying to use the libraries. > >> From the Terminal: >> Go Bears >echo $LD_LIBRARY_PATH >> /usr/lib/libboost_system.so > > Where do you get this from? > > "LD_LIBRARY_PATH, which is a colon-separated list of directories" [1] > > [1] http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html > >> Go Bears >make all >> g++ -L/usr/lib -lboost_system get_sys_info.cpp > > Have you installed it first? > > sudo apt-get install libboost-system-dev > > Best regards, > -- > Mateusz Loskot, http://mateusz.loskot.net

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Problem linking to serialisation library on Mac OSX
by Tim Burgess 07 Feb '13

07 Feb '13

Hi, I built my boost on Mac OSX 10.8 as follows: ./bootstrap.sh -prefix=/users/tim/developer/libraries/boost_1_50_0/stage ./b2 -address-model=32_64 stdlib=libc++ This ran boost.build with the Darwin toolset, as expected, and generated no errors. Checking the stage/lib folder revealed a complete set of static and dynamic library files with appropriate date-time stamps. I specified the linker as libc++ as the project I'm working on using XCode 4.6 uses wxWidgets 2.9.4, which requires that the project be compiled using Apple's GCC instead of the default compiler (this, in turn, means that libc++ becomes the linker used by the project). However, when I try to build my XCode project, I get errors of the form: Undefined symbols for architecture x86_64: "boost::archive::basic_xml_iarchive<boost::archive::xml_wiarchive>::load_sta rt(char All of the errors refer to boost::archive or boost::serialisation. My project also uses the boost FileSystem, IOStream and System libraries, which don't generate any errors. I've found an awful lot of references to this issue on the web (particularly StackOverflow), but have yet to find an answer/solution. I'm pretty sure that I'm using the correct command-line options (I didn't specify architecture=combined, as Mac OSX SDK 10.8 no longer supports PPC), but I'm confused by the plethora of available build options, as I'm a novice on this platform. The project is a cross-platform effort and the same source code presented to my Windows VS2010 32/64-bit project builds and runs. Similarly, the same project built and ran under Mac OSX 10.6 with XCode 3.6 - I'd gladly revert to the older Mac O/S and XCode except for the fact that I'm a blind developer and the debugger provided in XCode 3.6 is not accessible to me using Apple's VoiceOver speech output utility (the debugger in XCode 4.6 holds out more hope for being usable). I'd greatly appreciate any tips and tricks for resolving this problem, so many thanks in advance. Best wishes. Tim Burgess Raised Bar Ltd. Tel: +44 (0)1827 719822 Web: http://www.raisedbar.net We can supply Roland and Avid products with specialist pre and post-sales support for visually-impaired users - just drop us a line for a quote. Don't forget to sign our on-line petition to lobby for improved access to music education and music technology at: http://www.raisedbar.net/petition.htm

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Re: [Boost-users] enable_shared_from_this()
by John M. Dlugosz 07 Feb '13

07 Feb '13

On 2/5/2013 9:43 AM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: From: Dominique Devienne<ddevienne(a)gmail.com> > Thanks for any insight on this. Could very well be I'm missing > something obvious (my C++ expertise doesn't rise to Boost levels), but > so far I fail to see the drawbacks. My old smart pointers (dating back to the '90's) had full support for initializing a smart pointer from a raw pointer even if it was already known to the smart pointer system. It was one of six _essential_ features (I called it “lost and found”) and I agree there were no troubles with it. It is easy to do when the class is derived from a helper base (like enable_shared_from_this does) and furthermore it doesn't need the CRTP. I agree that an extension to the now-standard enable_self_from_this could be implemented that gives a self_from_this that may be called during the constructor or as the first way to obtain a shared_ptr, also provide for "lost and found" usage, and not behave differently for any usage that is well-formed using the standard class (that is, it would be a pure extension). When changing some existing code to use shared_ptr, I've wished something like that was available, and missed my old class in this respect. For new code, in general use a Create static member that wraps the call to the (private) constructor so you can't create anything other than a shared_ptr, and the stuff that needs the shared ptr during "construction" gets moved to the stage 2, in the body of Create. In particular, if the object registers itself with collaborators (via shared pointers) you really wanted that part _in_ the constructor. —John

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How do you compile Boost C++ code in Ubuntu?
by Giovanni 07 Feb '13

07 Feb '13

Greetings, I cannot compile my Boost C++ code. Initially, it complains of “undefined reference”. When I try to resolve this by including the library, I get the "/usr/bin/ld: cannot find -lboost_system" error. From the Terminal: Go Bears >echo $LD_LIBRARY_PATH /usr/lib/libboost_system.so Go Bears >make all g++ -L/usr/lib -lboost_system get_sys_info.cpp /usr/bin/ld: cannot find -lboost_system collect2: ld returned 1 exit status make: *** [all] Error 1 Go Bears > Do you know what stupid mistakes did I make? >From my Makefile: all: g++ -L/usr/lib -lboost_system get_sys_info.cpp ./a.out Thank you so much, and have an awesome day!

2 1

Using property_tree as json reader/writer
by niXman 07 Feb '13

07 Feb '13

Hi, Tell me please, anybody trying to use property_tree as json reader/writer for tasks more difficult than reading configuration files? Just wondering if anyone compared the performance of property_tree and other parsers? Thanks.

6 11

[BGL][Serialization] Reading a graph from a binary file: "vector subscript out of range error" and portability
by Nicholas Mario Wardhana 07 Feb '13

07 Feb '13

Hi all, I am trying to read a graph from a binary file. This file was previously generated by constructing a graph consisting of 1000 vertices and almost 10M edges. While vertices are properly loaded, I encountered a "vector subscript out of range error" when edges are being loaded in adj_list_serialize.hpp, line 97 (boost::tie(e,inserted) = add_edge(verts[u], verts[v], graph);). At this line, u and v are all in the order of millions, whereas I only have 1000 vertices. When I ran the program without debugging, it consumed the whole memory. I put a not-so-minimal working code at the end of my e-mail. Could somebody please point out any mistake in my code? FYI, I use Boost 1.52, Visual C++ 2010, Windows 7 64-bit. BTW, my aim is to generate save files which are fast to be read and can be read on different computers. I am aware that while this binary format can be processed fast, it is not portable. Can somebody please tell me how non-portable it is? If there are only a few things to be considered, for example architectural difference (32 vs 64-bit), it is fine as I only need to generate two files for one graph. But, if there are many of such factor, to the point that it is impossible to provide numerous save files, is there any equally fast format which is more portable? Thank you! Best regards, Nicholas Mario Wardhana //======================= CODE ===================================// #include <boost/graph/adjacency_list.hpp> #include <boost/graph/adj_list_serialize.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <fstream> struct Point { Point() : x(0.0f), y(0.0f), z(0.0f) { } float x; float y; float z; }; struct Node { Point point; float maxRadius; int motionType; int label; int ID; }; struct Edge { float cost; short int type; bool kept; bool skip; int nodeID1; int nodeID2; }; namespace boost { namespace serialization { template<class Archive> void serialize(Archive & ar, Point & v, const unsigned int version) { ar & v.x; ar & v.y; ar & v.z; } template<class Archive> void serialize(Archive & ar, Node & n, const unsigned int version) { ar & n.point; ar & n.maxRadius; ar & n.motionType; ar & n.label; ar & n.ID; } template<class Archive> void serialize(Archive & ar, Edge & e, const unsigned int version) { ar & e.cost; ar & e.type; ar & e.kept; ar & e.skip; ar & e.nodeID1; ar & e.nodeID2; } } // namespace serialization } // namespace boost typedef boost::adjacency_list<boost::setS, boost::vecS, boost::undirectedS, Node, // bundled data Edge, // bundled data boost::no_property, // not needed boost::listS> Graph; typedef boost::graph_traits<Graph>::vertex_iterator NodeIterator; typedef boost::graph_traits<Graph>::edge_iterator EdgeIterator; int main() { Graph g; for(int ID = 0; ID < 1000; ID++) { Node node; node.ID = ID; node.point.x = (float) ID; node.point.y = (float) ID; node.point.z = (float) ID; node.maxRadius = 1.0f; node.motionType = 0; node.label = 0; boost::add_vertex(node, g); } std::pair<NodeIterator, NodeIterator> vertexIterators = boost::vertices(g); NodeIterator nodeIterator1 = vertexIterators.first; for(; nodeIterator1 != vertexIterators.second; nodeIterator1++) { for(NodeIterator nodeIterator2 = nodeIterator1; nodeIterator2 != vertexIterators.second; nodeIterator2++) { if(*nodeIterator1 == *nodeIterator2) continue; Edge edge; edge.cost = 1.0f; edge.kept = true; edge.skip = false; edge.type = 0; edge.nodeID1 = g[*nodeIterator1].ID; edge.nodeID2 = g[*nodeIterator2].ID; boost::add_edge(*nodeIterator1, *nodeIterator2, edge, g); } } std::cout << "Number of nodes = " << boost::num_vertices(g) << std::endl; std::cout << "Number of edges = " << boost::num_edges(g) << std::endl; std::cout << "SAVE!" << std::endl; std::ofstream filename1("binary_serialization.txt"); boost::archive::binary_oarchive binary_oa(filename1); binary_oa & g; filename1.close(); std::cout << "LOAD!" << std::endl; Graph g3; std::ifstream filename2("binary_serialization.txt", std::ios::binary); try { boost::archive::binary_iarchive binary_ia(filename2); binary_ia & g3; // error here }catch (std::exception& e) { std::cout << e.what() << std::endl; } std::cout << "Number of nodes = " << boost::num_vertices(g3) << std::endl; std::cout << "Number of edges = " << boost::num_edges(g3) << std::endl; int a = 0; std::cin >> a; return 0; }

2 4

Re: [Boost-users] in IOS, thread_info object is being destructed before the thread finishes executing (Andy Weinstein)
by Andy Weinstein 06 Feb '13

06 Feb '13

I have solved this problem. Please see my post in stack overflow at: http://stackoverflow.com/questions/14692802/boost-threads-in-ios-thread-inf… The short answer is that the IOS boost.sh script needs to be modified to use BOOST_SP_USE_SPINLOCK instead of BOOST_SP_USE_PTHREADS. But there are a lot of details involved in getting this to work in IOS which are described in that post. Maybe also a small modification to the boost code in spinlock_gcc_arm.hpp, but I need to verify that a change I made along the way is absolutely necessary.

1 0

max value by the number of bits
by Christian Henning 06 Feb '13

06 Feb '13

Hi there, is there a general template for calculating the max value by the number of bits. GIL right now uses the following template: template <int K> struct unsigned_integral_max_value<packed_channel_value<K> > : public mpl::integral_c<typename packed_channel_value<K>::integer_t, (1<<K)-1> {}; This code gives me some compiler errors with clang 3.2. for K = 31, for instance. Ideally I would like to take K up to 64. A small fix gets me up to K = 63 template <int K> struct unsigned_integral_max_value<packed_channel_value<K> > : public mpl::integral_c<typename packed_channel_value<K>::integer_t, (uint64_t(1)<<K)-1> {}; Is there a better way in boost? Thanks, Christian

6 14

[Auto-link] Visual Studio doesn't search for the correct libraries
by Angelo Moscati 06 Feb '13

06 Feb '13

Hi, I recently moved from Boost version 1.49 to 1.52. I want to use the static library versions but the autolink keep to requeire the dynamic one. This is the command line i use to build boost on Windows: set REQUESTED_BOOST_LIBRARIES=--with-serialization --with-thread --with-date_time --with-system --with-regex --with-filesystem --with-log set ADDITIONAL_BOOST_FLAGS=define=BOOST_LOG_NO_COMPILER_TLS rem x86 .\b2 -j 8 link=static runtime-link=static runtime-debugging=on variant=debug threading=multi --abbreviate-paths architecture=x86 --stagedir=stage\x86\debug %ADDITIONAL_BOOST_FLAGS% %REQUESTED_BOOST_LIBRARIES% When i try to build my application, i get the follow errors (it builds fine with Boost 1.49): error LNK1104: cannot open file 'libboost_filesystem-vc100-mt-gd-1_52.lib'. But the library i built is libboost_filesystem-vc100-mt-sgd-1_52.lib. Can you tell me what i do wrong? Thanks, Angelo

1 2

[string.algo] find_iterator, gives compile error in Boost 1.53
by gast128 06 Feb '13

06 Feb '13

Hello all, just dl Boost 1.53 and now I get a compile error in 'find_iterator' when using a forward iterator. Probably related to the change 'increment'. It now uses begin() + 1, and the + operator is not defined for the supplied iterator.

2 3

Archive search
by Angelo Moscati 06 Feb '13

06 Feb '13

Hi, I would like to know if there is a way to search the archive before asking questions. Thanks, Angelo

2 2

[program_options] Is it possible to change semantics after add_options() ?
by lukasz kucharski 06 Feb '13

06 Feb '13

Hello, I would like to ask if it is possible to change value_semantic associated with a program_option after it has been created ? I create `program_options` instance and populate it with add_options. Like in the examples provided by the documentation. I would like to change the semantics of a particular option later on. Is this even possible, or is this functionality deliberately disabled. I figured out that one can use options_description::find(), then strip it out `const`ness and dynamic cast to `typed_value_base` and use its methods. My motivation is such a design. I have a set of applications, which have a common subset of command line options/switches. However, they differ a bit in semantics. I.e. default value. I decided to refactor common parts into some `BasicApp` class and I thought I could move common options along with it as `boost::program_options` OO design should naturally support it. And it worked like a charm with `add_options` semantics to add new options. Up to the point I needed to change existing default values. Is there a proper way to do it ? Removing `const` constraint seems a bad approach since it looks like it's left there on purpose. Or my use-case is ill or hopeless. With regards, Łukasz.

1 0

enable_shared_from_this()
by Dominique Devienne 06 Feb '13

06 Feb '13

Can someone please explain why this code: struct Foo : boost::enable_shared_from_this<Foo> {}; Foo* p_foo = new Foo; boost::shared_ptr<Foo> ptr_foo(p_foo->shared_from_this()); is throwing? msvcr100d.dll!_CxxThrowException(void * pExceptionObject, const _s__ThrowInfo * pThrowInfo) Line 157 C++ boost::throw_exception<boost::bad_weak_ptr>(const boost::bad_weak_ptr & e) Line 61 + 0x4d bytes C++ boost::detail::shared_count::shared_count(const boost::detail::weak_count & r) Line 421 + 0x23 bytes C++ boost::shared_ptr<`anonymous namespace'::Foo>::shared_ptr<`anonymous namespace'::Foo><`anonymous namespace'::Foo>(const boost::weak_ptr<`anonymous namespace'::Foo> & r) Line 216 C++ boost::enable_shared_from_this<`anonymous namespace'::Foo>::shared_from_this() Line 49 + 0xf bytes C++ > `anonymous namespace'::test_method() Line 41 + 0xf bytes C++ Since Foo embeds a weak_ptr, why can't it new the pi_ on the spot? (I'm using Boost 1.44). Thanks, --DD PS: On a related note, why doesn't boost::shared_ptr<Foo>(p_foo) (where p_foo is a raw Foo*) implicitly apply the aliasing Ctor, to share the same px, to avoid the classic bug of having several different pn on the same px, since p_foo derives from enable_shared_from_this()? Initially i thought that's what sp_enable_shared_from_this() and pe->_internal_accept_owner() were meant to do, but obviously that's not the case.

4 4

Boost statechart design question
by sidharth shanbhag 05 Feb '13

05 Feb '13

Hi, I am designing an application using Boost statechart and needed some advice. I have multiple objects of the same type/functionality, however they are not related by an inheritance heirachy. The class types have a defined initialization sequence which move from 1 state to another. A few of these state initialization steps are the same eg. Resource X should be initialized as the second step in the sequence. But X can be initialized only once in the process. I am looking at doing the following: - Creating a statechart for every object, to manage its initialization. - Each state machine will maintain the pointer of the class object it has initialized. - A map of object Name -> State Machine will be created to ensure every object is initialized correctly. - Represent resource X as a separate state, which after its initialization will transition to the next state. Is there a potentially better way to do this considering: - There can be multiple objects of different class types - New objects can be added during runtime. Thanks, Sid

2 1

How can I free memory allocated when deserializing with boost::archive::text_iarchive
by Adlai Shawareb 05 Feb '13

05 Feb '13

Thanks for your reply. Here is a code sample: std::istringstream istr; <* put data into istr here *> boost::archive::text_iarchive ia(istr_); Message* p_temp; ia & p_temp; mpBaseIncomingMessage = p_temp; // mpBaseIncomingMessage is of type (Message *) mpIncomingMessage = static_cast<SystemMessage*>(mpBaseIncomingMessage); // mpIncomingMessage is a pointer to a class derived from Message mObjectCallbackMap.process(mpIncomingMessage->mEvent); // execute a callback for this event delete mpIncomingMessage; // delete the allocated memory We then see a crash on either the " mObjectCallbackMap.process..." line or the " delete mpIncomingMessage", but only when certain actions are taken by the system. Any thoughts would be greatly appreciated. Regards, Adlai -----Original Message----- From: Boost-users [mailto:boost-users-bounces@lists.boost.org] On Behalf Of boost-users-request(a)lists.boost.org Sent: Monday, February 04, 2013 1:11 PM To: boost-users(a)lists.boost.org Subject: Boost-users Digest, Vol 3349, Issue 6 Send Boost-users mailing list submissions to boost-users(a)lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. Re: Crediting the Work of Others (Bill Buklis) 2. How can I free memory allocated when deserializing with boost::archive::text_iarchive (Adlai Shawareb) 3. Re: in IOS, thread_info object is being destructed before the thread finishes executing (Nat Linden) 4. Re: Undirected version of dijkstra shortest path on directed graph. (Jeremiah Willcock) 5. Re: Crediting the Work of Others (Algocoders) 6. Re: How can I free memory allocated when deserializing with boost::archive::text_iarchive (Tim Moore) 7. [mpl::integral_c] Compiler Error with Visual Studio 2010 (Christian Henning) 8. Re: [mpl::integral_c] Compiler Error with Visual Studio 2010 (Nathan Crookston) ---------------------------------------------------------------------- Message: 1 Date: Mon, 04 Feb 2013 13:18:47 -0600 From: Bill Buklis <boostusr(a)pbjzone.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Crediting the Work of Others Message-ID: <51100997.1050909(a)pbjzone.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed On 2/1/2013 1:33 PM, Algocoders wrote: > Dave Abrahams <dave <at> boostpro.com> writes: > >> >> It has come to my attention that this book appears to use the work of >> others without attribution. I'd like to give the authors a chance to >> explain why that appearance is false. From what you can see in >> Amazon's limited preview of the book, one can find numerous instances >> of code lifted from Andrew Sutton's "origin" library. >> Some of the data structures have been renamed or had the case changed. >> Most of the duplication of Origin code comes in Chapter 7 in that >> book. There appear to be no references to Origin in that chapter >> (based on searching through the book in Amazon). >> >> The IndirectlyCopyable text includes unsourced quotes directly from >> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3351.pdf >> without quotation, and the concepts* diagrams are taken from the same >> document. Is there an attribution on the previous page that we can't >> see from Amazon's limited preview? > Crediting the work of others have been done in the book as mentioned > in the links below: > Preface : > http://www.algocoders.com/sites/default/files/preface_foa_revised.pdf > Acknowledgement : > http://www/algocoders.com/sites/default/files/acknowledgement_foa.pdf > Table of Contents : > http://www.algocoders.com/sites/default/files/toc_foa_revised.pdf > > Chapter 3 : > http://www.algocoders.com/sites/default/files/chapter3_foa.pdf > Chapter 11 : > http://www.algocoders.com/sites/default/files/chapter11_foa.pdf > > We have avoided repetitive mention of original sources in respective > chapters to let not the content be littered with these details again. > Please let us know if we need to attribute in respective chapters too, > we would like to work on it. > Your feedback will be really helpful to guide us as a corrective measure. > > Looking forward for suggestions, > > Cheers, > Algocoders > Only the last link for Chapter 11 actually works and there aren't any acknowledgements presented in that pdf. -- Bill ------------------------------ Message: 2 Date: Mon, 4 Feb 2013 19:46:54 +0000 From: Adlai Shawareb <adlai(a)vytronus.com> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: [Boost-users] How can I free memory allocated when deserializing with boost::archive::text_iarchive Message-ID: <842DD0CD91745A48B9355924E2CF0BEA114FEF3D(a)VYTRONUS-SBS.vytronus.local> Content-Type: text/plain; charset="us-ascii" Hi, Does anyone know how we can free memory that is dynamically allocated by boost::archive::text_iarchive when deserializing an archive? We have tried using 'delete' and free() on the pointer when we finish with it, but it results in a crash. How does Boost dynamically allocate memory, 'new', 'malloc', or other? We tried a shared_ptr, but were getting compile errors related to the include files, and have not gone back to track that down. So if there is a simple way to free the memory that would be best for our application. Thanks, Adlai Shawareb Vytronus, Inc.

2 1

Boost 1.53.0 released!
by Marshall Clow 04 Feb '13

04 Feb '13

Release 1.53.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains five new libraries and numerous enhancements and bug fixes for existing libraries. New Libraries: * Atomic: C++11-style atomic<>, from Helge Bahmann, maintained by Tim Blechmann. * Coroutine: Coroutine library, from Oliver Kowalke. * Lockfree: Lockfree data structures, from Tim Blechmann. * Multiprecision: Extended precision arithmetic types for floating point, integer and rational arithmetic from John Maddock and Christopher Kormanyos. * Odeint: Solving ordinary differential equations, from Karsten Ahnert and Mario Mulansky. For details, including download links, see http://www.boost.org/users/news/version_1.53.0 You can also download directly from SourceForge: http://sourceforge.net/projects/boost/files/boost/1.53.0/ To install this release on your system, see http://www.boost.org/doc/libs/release/more/getting_started/index.html Thanks, --The Boost release team Beman Dawes Daniel James Eric Niebler Marshall Clow Rene Rivera Vladimir Prus

2 2

[mpl::integral_c] Compiler Error with Visual Studio 2010
by Christian Henning 04 Feb '13

04 Feb '13

Hi there, shouldn't the following work: #include <boost\gil\gil_all.hpp> using namespace std; using namespace boost; int main() { typedef mpl::integral_c< unsigned char , numeric_limits< unsigned char >::max() > my_max_value_t; return 0; } Visual Studio 2010 gives me: error C2975: 'N' : invalid template argument for 'boost::mpl::integral_c', expected compile-time constant expression I'm a little surprised that this isn't working. Thanks, Christian

2 2

How can I free memory allocated when deserializing with boost::archive::text_iarchive
by Adlai Shawareb 04 Feb '13

04 Feb '13

Hi, Does anyone know how we can free memory that is dynamically allocated by boost::archive::text_iarchive when deserializing an archive? We have tried using 'delete' and free() on the pointer when we finish with it, but it results in a crash. How does Boost dynamically allocate memory, 'new', 'malloc', or other? We tried a shared_ptr, but were getting compile errors related to the include files, and have not gone back to track that down. So if there is a simple way to free the memory that would be best for our application. Thanks, Adlai Shawareb Vytronus, Inc.

2 1

A cool book for c++11 is Published now (Revised Edition)
by Algocoders . 04 Feb '13

04 Feb '13

Hi All, Revised edition of the book : "Foundation of Algorithms in C++11, Volume 1(Revised Edition): Using and Extending C++11, Boost And Beyond" : is available now. @Amazon: http://www.amazon.com/Foundation-Algorithms-Volume-Revised-Edition/dp/14819… @Pothi.com (Indian Edition): http://pothi.com/pothi/book/chandra-shekhar-kumar-foundation-algorithms-c11… This book is vital to understand and extend the C++11 Algorithms by carefully worked out synthesis of language and library features with an eye at future evolution with special emphasis to : - Template Alias - constexpr - copy_backward - requires - std::enable_if : SFINAE - Private Cast - Type Functions - Type Traits - Explicit Template Instantiations and Specializations - Trailing Return Type - auto type specifier - Intermediate Traits Idiom - Value Type Deduction Framework Table of Contents : http://algocoders.com/sites/default/files/toc_foa_revised.pdf Sample Chapter : http://algocoders.com/sites/default/files/chapter1_foa_revised.pdf For more details, please visit the link : http://www.algocoders.com/article/books Have Fun ! Cheers, Algocoders http://www.algocoders.com

4 5

Undirected version of dijkstra shortest path on directed graph.
by Jupp Tscheak 04 Feb '13

04 Feb '13

Hello BGL specialists. Is it possible to use an undirected version of dijkstra shortest path function on an /adjacency_list/ which /Directed/ template parameter is set to bidirectional? Thanks in advance :)

2 1

in IOS, thread_info object is being destructed before the thread finishes executing
by Andy Weinstein 04 Feb '13

04 Feb '13

Our project uses a few boost 1.48 libraries on several platforms, including Windows, Mac, Android, and IOS. We are able to consistently get the IOS version of the project to crash (nontrivially but reliably) when using IOS, and from our investigation we see that ~thread_data_base is being called on the thread's thread_info while its thread is still running. This seems to happen as a result of the smart pointer reaching a zero count, even though it is obviously still in scope in the thread_proxy function which creates it and runs the requested function in the thread. This seems to happen in various cases - the call stack is not identical between crashes, though there are a few variations which are common. Just to be clear - this often requires running code which is creating hundreds of threads, though there are never more than about 30 running simultaneously. I have "been lucky" and got it very very early in the run also, but that's rare. I created a version of the destructor which actually catches the code red-handed: in libs/thread/src/pthread/thread.cpp: thread_data_base::~thread_data_base() { boost::detail::thread_data_base* const thread_info=detail::get_current_thread_data(); void *void_thread_info = (void *) thread_info; void *void_this = (void *) this; // is somebody destructing the thread_data other than its own thread? // (remember that its own which should no longer point to it anyway, // because of the call to detail::set_current_thread_data(0) in thread_proxy) if (void_thread_info) { // == void_this) { __builtin_trap(); } } I should note that (as seen from the commented-out code) I had previously checked to see that void_thread_info == void_this because I was only checking for the case where the thread's current thread_info was killing itself. I have also seen cases where the value returned by get_current_thread_data is non-zero and different from "this", which is really weird. Also when I first wrote that version of the code, I wrote: if (((void*)thread_info) == ((void*)this)) and at run-time I got some very weird exception that said I something about a virtual function table or something like that - I don't remember. I decided that it was trying to call "==" for this object type and was unhappy with that, so I rewrote as above, putting the conversions to void * as separate lines of code. That in itself is quite suspicious to me. I am not one to run to rush to blame compilers, but... I should also note that when we did catch this happening the trap, we saw the destructor for ~shared_count appear twice consecutively on the stack in Xcode source. Very doubleweird. We tried to look at the disassembly, but couldn't make much out of it. Again - it looks like this is always a result of the shared_count which seems to be owned by the shared_ptr which owns the thread_info reaching zero too early. Help! Thanks, Andy Weinstein PS I cannot say for sure yet whether this problem occurs on the other platforms, though it looks like Windows is more solid that Mac. Android pretty solid also, though maybe in between Windows and Mac.

2 1

Question regarding circular buffer usage
by Salivar.William 04 Feb '13

04 Feb '13

I am using the circular buffer container to hold up to 10000 std string objects. I am finding that once the buffer has reached max capacity, memory continues to be consumed as I push new strings in. Is there something I'm missing? I stepped into the boost code and it does make a copy of the string using the std string operator so I would think it handles the string copy properly. The size of the strings are variable but I would expect the memory usage to be fairly stable when the buffer is full but that is not the case. Here's basic usage Definition: boost::circular_buffer<std::string> m_message_buffer; Initialization: m_message_buffer.set_capacity (10000); Usage: void myClass::writeToBuffer (const char *message) { m_message_buffer.push_back (string (message)); } Boost code: void push_back(param_value_type item = value_type()) { if (full()) { if (empty()) return; replace(m_last, item); increment(m_last); m_first = m_last; } else { m_alloc.construct(m_last, item); increment(m_last); ++m_size; } } void replace(pointer pos, param_value_type item) { *pos = item; #if BOOST_CB_ENABLE_DEBUG invalidate_iterators(iterator(this, pos)); #endif }

2 2

How to uninstall/reinstall boost by using ./b2 command?
by JIA Pei 04 Feb '13

04 Feb '13

Hi, all: I installed boost by using *./bootstrap.sh* *./b2 install --prefix=/usr* However, I missed two files,* patchlevel.h* and *bzlib.h*: So, afterwards, I have the following two packages installed: *libbz2-dev*and * libpython3.3-dev* . I would like to have a full boost_1_52_0 re-installed. But now, even if I have the files: *libbz2-dev: /usr/include/bzlib.h* *libpython3.3-dev: /usr/include/python3.3m/patchlevel.h* during the re-installation of boost, it still keeps reporting 2 errors: *fatal error: bzlib.h: No such file or directory* *fatal error: patchlevel.h: No such file or directory* So, any suggestions? Cheeers -- Pei JIA Email: jp4work(a)gmail.com cell: +1 604-362-5816 Welcome to Vision Open http://www.visionopen.com

1 0

Re: [Boost-users] in IOS, thread_info object is being destructed before the thread finishes executing (Andy Weinstein)
by Andy Weinstein 04 Feb '13

04 Feb '13

I should note that the boost.sh from Pete Goodliffe (and modified by others) that is commonly used to compile boost for IOS has the following note in the header: : ${EXTRA_CPPFLAGS:="-DBOOST_AC_USE_PTHREADS -DBOOST_SP_USE_PTHREADS"} # The EXTRA_CPPFLAGS definition works around a thread race issue in # shared_ptr. I encountered this historically and have not verified that # the fix is no longer required. Without using the posix thread primitives # an invalid compare-and-swap ARM instruction (non-thread-safe) was used for the # shared_ptr use count causing nasty and subtle bugs. # # Should perhaps also consider/use instead: -BOOST_SP_USE_PTHREADS I use those flags, but to no avail. I also found that there is an alternate implementation inside boost for arm processors which seems also to directly address this issue: spinlock_gcc_arm.hpp The version included with boost 1.48 uses outdated arm assembly. I took the updated version from boost 1.52, but I'm having trouble compiling it. I get the following error: predicated instructions must be in IT block I found a reference to what looks to be a similar use of this instruction here: https://zeromq.jira.com/browse/LIBZMQ-414 I was able to use the same idea to get the 1.52 code to compile by modifying the code as follows (I inserted an appropriate IT instruction) __asm__ __volatile__( "ldrex %0, [%2]; \n" "cmp %0, %1; \n" "it ne; \n" "strexne %0, %1, [%2]; \n" BOOST_SP_ARM_BARRIER : "=&r"( r ): // outputs "r"( 1 ), "r"( &v_ ): // inputs "memory", "cc" ); But in any case, there are ifdefs in this file which look for the arm architecture, which is not defined that way in my environment. After I simply edited the file so that only ARM 7 code was left, the compiler complains about the definition of BOOST_SP_ARM_BARRIER: In file included from ./boost/smart_ptr/detail/spinlock.hpp:35: ./boost/smart_ptr/detail/spinlock_gcc_arm.hpp:39:13: error: instruction requires a CPU feature not currently enabled BOOST_SP_ARM_BARRIER : ^ ./boost/smart_ptr/detail/spinlock_gcc_arm.hpp:13:32: note: expanded from macro 'BOOST_SP_ARM_BARRIER' # define BOOST_SP_ARM_BARRIER "dmb" So that's where thing stand. I am hopefully awaiting your help…. Thanks! On Feb 4, 2013, at 3:38 PM, <boost-users-request(a)lists.boost.org<mailto:boost-users-request@lists.boost.org>> wrote: Send Boost-users mailing list submissions to boost-users(a)lists.boost.org<mailto:boost-users@lists.boost.org> To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. in IOS, thread_info object is being destructed before the thread finishes executing (Andy Weinstein) ---------------------------------------------------------------------- Message: 1 Date: Mon, 4 Feb 2013 12:38:29 +0000 From: Andy Weinstein <andyw(a)hyperlync.com> To: "Boost-users(a)lists.boost.org" <Boost-users(a)lists.boost.org> Cc: Moshe Rubin <moshe(a)hyperlync.com>, Ronnie Wulfsohn <roni(a)hyperlync.com> Subject: [Boost-users] in IOS, thread_info object is being destructed before the thread finishes executing Message-ID: <5D324B34-BE82-4B4C-89AD-ED8A0095129B(a)hyperlync.com> Content-Type: text/plain; charset="us-ascii" Our project uses a few boost 1.48 libraries on several platforms, including Windows, Mac, Android, and IOS. We are able to consistently get the IOS version of the project to crash (nontrivially but reliably) when using IOS, and from our investigation we see that ~thread_data_base is being called on the thread's thread_info while its thread is still running. This seems to happen as a result of the smart pointer reaching a zero count, even though it is obviously still in scope in the thread_proxy function which creates it and runs the requested function in the thread. This seems to happen in various cases - the call stack is not identical between crashes, though there are a few variations which are common. Just to be clear - this often requires running code which is creating hundreds of threads, though there are never more than about 30 running simultaneously. I have "been lucky" and got it very very early in the run also, but that's rare. I created a version of the destructor which actually catches the code red-handed: in libs/thread/src/pthread/thread.cpp: thread_data_base::~thread_data_base() { boost::detail::thread_data_base* const thread_info=detail::get_current_thread_data(); void *void_thread_info = (void *) thread_info; void *void_this = (void *) this; // is somebody destructing the thread_data other than its own thread? // (remember that its own which should no longer point to it anyway, // because of the call to detail::set_current_thread_data(0) in thread_proxy) if (void_thread_info) { // == void_this) { __builtin_trap(); } } I should note that (as seen from the commented-out code) I had previously checked to see that void_thread_info == void_this because I was only checking for the case where the thread's current thread_info was killing itself. I have also seen cases where the value returned by get_current_thread_data is non-zero and different from "this", which is really weird. Also when I first wrote that version of the code, I wrote: if (((void*)thread_info) == ((void*)this)) and at run-time I got some very weird exception that said I something about a virtual function table or something like that - I don't remember. I decided that it was trying to call "==" for this object type and was unhappy with that, so I rewrote as above, putting the conversions to void * as separate lines of code. That in itself is quite suspicious to me. I am not one to run to rush to blame compilers, but... I should also note that when we did catch this happening the trap, we saw the destructor for ~shared_count appear twice consecutively on the stack in Xcode source. Very doubleweird. We tried to look at the disassembly, but couldn't make much out of it. Again - it looks like this is always a result of the shared_count which seems to be owned by the shared_ptr which owns the thread_info reaching zero too early. Help! Thanks, Andy Weinstein PS I cannot say for sure yet whether this problem occurs on the other platforms, though it looks like Windows is more solid that Mac. Android pretty solid also, though maybe in between Windows and Mac.

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Re: [Boost-users] [Graph] "Weighted Bacon number" (depth from node) with dijkstra visitor
by Tasos 04 Feb '13

04 Feb '13

Yes, Im just blind, it was so simple. Thanks a lot for your help. Best, Tasos

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[Graph] "Weighted Bacon number" (depth from node) with dijkstra visitor
by The Maschine 04 Feb '13

04 Feb '13

Hi all, In order to find the depth of a source_node from other nodes in my graph, without weights, I use this simple example of the bacon BFS visitor via the tree_edge(). I also count the number of nodes from that source. //////// class bfs_vis : public boost::default_bfs_visitor { public: bfs_vis(unGraph::vertex_descriptor source, boost::shared_ptr< VertexStorage> storage) : s(source), cont(storage) { } template <typename Edge, typename Graph> void tree_edge(Edge e, const Graph& g) const { typename boost::graph_traits<Graph>::vertex_descriptor u = source(e, g), v = target(e, g); cont->depth_from->at(v) = cont->depth_from->at(u) + 1.0; } template <typename Edge, typename Graph> void discover_vertex(Edge e, Graph& g) { cont->node_count = cont->node_count + 1; } private: boost::shared_ptr<VertexStorage> cont; unGraph::vertex_descriptor s; }; //////// What would be an equivalent visitor for Dijkstra? Node count is ok but how do I calculate a "weighted bacon number" with dijkstra (boost::property<boost::edge_weight_t, float>)?? Thanks, Tasos

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Re: [Boost-users] Boost-users Digest, Vol 3349, Issue 1
by Torsten＠Robitzki.de 04 Feb '13

04 Feb '13

Hi Igor, Am 04.02.2013 um 14:15 schrieb boost-users-request(a)lists.boost.org: > Send Boost-users mailing list submit >> >> s.close(); // first time to cancel outstanding handlers >> s.close(); // a second time, later in the d'tor >> But what does 'Bad file descriptor' mean in this context? Is the underlying socket is somehow broken/corrupted? If so, there must be >> a bug in my code. If not, is it save to simply ignore the error? > > > It means that tcp::socket is closed (and the underlying native > descriptor is something like -1). do you think there is something wrong with closing the socket a second time? The documentation doesn't states any precondition. kind regards Torsten

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[function / bind] How to register callbacks using boost::function/bind?
by Olivier Tournaire 04 Feb '13

04 Feb '13

Hi all, I am trying to use a callback mechanism for logging in my app. I thus have a class with : class coordinates_converter { public: coordinates_converter(int id); ~coordinates_converter(); void register_error_callback (const boost::function<void(std::string message)> &callback ) { _error_callback = callback; } private: boost::function<void(std::string message)> _error_callback; } Now, if I want to register a log error callback in another object instance, how should I do this? Cannot find the right syntax ... void another_class::do() { acute_coordinates_converter* converter = new coordinates_converter(2154); converter->register_error_callback( boost::bind(&another_class::log_error, converter, _1) ); } where log_error is a Qt SIGNAL: signals: void log_error(const std::string& error); Hope you could help. Rehads, Olivier

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[asio] How to handle 'Bad file descriptor'
by Torsten＠Robitzki.de 03 Feb '13

03 Feb '13

Hello, I have problems to understand, what might causing a 'Bad file descriptor' exception to be thrown in my application. The exception is most likely thrown by a call to tcp::socket::close. From the logs I have, I'm quit certain, that the last function calls on a socket are: s.shutdown(tcp::socket::shutdown_receive); s.shutdown(tcp::socket::shutdown_send); s.close(); // first time to cancel outstanding handlers s.close(); // a second time, later in the d'tor I'm not sure, whether it's the first or the second call to close(), that causes the exception. But what does 'Bad file descriptor' mean in this context? Is the underlying socket is somehow broken/corrupted? If so, there must be a bug in my code. If not, is it save to simply ignore the error? The program is not single threaded, but there is only one boost::io_service object which is run by a single dedicated thread. Kind reagards Torsten P.S: if someone interested in the code: https://github.com/TorstenRobitzki/Sioux/blob/master/source/server/connecti…; it's open source

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